diff --git a/TODO.md b/TODO.md
index b508d64..1c7ae34 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2829,6 +2829,37 @@ categories in the "still open" list above have no Lauds/Vespers bundle authored
 same honest incremental-content gap, now on a mechanism that no longer silently drops to the
 ferial default for any rank.
 
+### Common-of-a-Martyr(-Bishop) Lauds/Vespers bundle authored (2026-08-26)
+
+**Bug flagged by the user, live**: St. Zephyrinus (Aug 26, `common-of-a-martyr-bishop`,
+Simplex) claims First Vespers over St. Louis's Aug 25 (see `calendar/vespers.ts`'s
+`hasFirstVespers`), but that evening's Vespers/Compline were showing the plain Tuesday ferial
+hymn ("Cæli Deus sanctíssime") instead of a real Common-of-a-Martyr hymn — the same
+rank-agnostic Common-fallback mechanism from the entry above, just with no content authored yet
+for this category, so `resolveOfficeBundle` fell all the way through.
+
+**Proof authored, next category in the "still open" list**: `common-of-a-martyr-bishop`'s full
+Lauds bundle (chapter Jac 1:12, short responsory "Glória et honóre," hymn "Martyr Dei, qui
+únicum," versicle "Justus ut palma florébit") and Vespers bundle (chapter reused from Lauds,
+short responsory "Posuísti, Dómine," hymn "Deus tuórum mílitum," versicle same as Lauds's),
+live-verified against Divinum Officium (Monastic Tridentinum 1617) `votive=C2b` — the
+votive-office view was needed for the same structural reason as Confessor-Not-Bishop's own
+Vespers bundle: every real Common-of-a-Martyr-Bishop saint on this app's calendar either has
+proper content of his own (St. Lawrence, St. Stephen) or never reaches the rank needed to keep
+his own evening (St. Zephyrinus and St. Callistus, Simplex and plain Duplex respectively — both
+live-checked: Callistus's own real Vespers query resolved to "Vespera de Tempore occurente,"
+i.e. his own Second Vespers is itself always lost, confirming this isn't just a Simplex-rank
+quirk). Cross-checked `votive=C2`/`C2a`/`C2b`/`C2-1` all render byte-identical Vespers/Lauds
+hymn text, confirming the earlier Matins-psalmody finding (`common-of-a-martyr-bishop` and
+`common-of-a-martyr` share real content) extends to this bundle too — so the same 7 files were
+duplicated verbatim under the plain `common-of-a-martyr` id as well (St. Hadrian, St. Hermes,
+St. Fidelis of Sigmaringen), since `resolveOfficeBundle` has no alias mechanism the way the
+Matins-psalmody category tier does.
+
+`npm test` (479 tests), `tsc --noEmit` both pass. **Still open**: 9 Common categories remain
+with no Lauds/Vespers bundle authored (Confessor, Confessor-Bishop, Virgin, Virgin-Martyr,
+Doctor, Apostle, Several-Martyrs, Several-Confessors, Holy Woman/Widow).
+
 ## Known, deliberate simplifications (not bugs — working as designed)
 
 - `getDayCollects`: each collect in a multi-collect day renders as its own
diff --git a/src/data/propers/common/lauds-capitulum-common-of-a-martyr-bishop.yml b/src/data/propers/common/lauds-capitulum-common-of-a-martyr-bishop.yml
new file mode 100644
index 0000000..121197e
--- /dev/null
+++ b/src/data/propers/common/lauds-capitulum-common-of-a-martyr-bishop.yml
@@ -0,0 +1,23 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2b` live query, 2026-08 -- used instead of a real saint's own
+# day for the same reason recorded in vespers-hymn-common-of-a-martyr-
+# bishop.yml's header (every real Common-of-a-Martyr-Bishop saint either
+# has proper content of his own -- St. Lawrence, St. Stephen -- or never
+# reaches the rank needed to keep his own hour un-outranked -- St.
+# Zephyrinus, St. Callistus). Byte-identical to `votive=C2`/`C2a` (plain
+# Common of a Martyr), confirming TODO.md's earlier finding that these
+# categories share real content, not just their Matins psalmody. Same
+# chapter reused for Vespers -- no separate vespers-capitulum-<id> file
+# authored, per vespers.ts's vespersCapitulumForOverride fallback (see
+# its own doc comment) -- same convention as Common-of-a-Confessor-Not-
+# Bishop's identical Lauds/Vespers chapter.
+id: lauds-capitulum-common-of-a-martyr-bishop
+text:
+  la: "Beátus vir, qui suffert tentatiónem: quóniam cum probátus fúerit, accípiet corónam vitæ, quam repromísit Deus diligéntibus se."
+  en: "Blessed is the man that endureth temptation; for when he hath been proved, he shall receive a crown of life, which God hath promised to them that love him."
+citation:
+  la: "Jac 1:12"
+  en: "Jas 1:12"
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/lauds-capitulum-common-of-a-martyr.yml b/src/data/propers/common/lauds-capitulum-common-of-a-martyr.yml
new file mode 100644
index 0000000..6f02665
--- /dev/null
+++ b/src/data/propers/common/lauds-capitulum-common-of-a-martyr.yml
@@ -0,0 +1,23 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2` live query, 2026-08 -- used instead of a real saint's own
+# day for the same reason recorded in vespers-hymn-common-of-a-martyr-
+# bishop.yml's header (every real Common-of-a-Martyr-Bishop saint either
+# has proper content of his own -- St. Lawrence, St. Stephen -- or never
+# reaches the rank needed to keep his own hour un-outranked -- St.
+# Zephyrinus, St. Callistus). Byte-identical to `votive=C2`/`C2a` (plain
+# Common of a Martyr), confirming TODO.md's earlier finding that these
+# categories share real content, not just their Matins psalmody. Same
+# chapter reused for Vespers -- no separate vespers-capitulum-<id> file
+# authored, per vespers.ts's vespersCapitulumForOverride fallback (see
+# its own doc comment) -- same convention as Common-of-a-Confessor-Not-
+# Bishop's identical Lauds/Vespers chapter.
+id: lauds-capitulum-common-of-a-martyr
+text:
+  la: "Beátus vir, qui suffert tentatiónem: quóniam cum probátus fúerit, accípiet corónam vitæ, quam repromísit Deus diligéntibus se."
+  en: "Blessed is the man that endureth temptation; for when he hath been proved, he shall receive a crown of life, which God hath promised to them that love him."
+citation:
+  la: "Jac 1:12"
+  en: "Jas 1:12"
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/lauds-hymn-common-of-a-martyr-bishop.yml b/src/data/propers/common/lauds-hymn-common-of-a-martyr-bishop.yml
new file mode 100644
index 0000000..686ffdf
--- /dev/null
+++ b/src/data/propers/common/lauds-hymn-common-of-a-martyr-bishop.yml
@@ -0,0 +1,81 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2b` live query, 2026-08 -- see lauds-capitulum-common-of-a-
+# martyr-bishop.yml's header for why the votive-office view was used.
+# "Martyr Dei, qui únicum" -- the classic Common-of-a-Martyr Lauds hymn,
+# a single genuine recension (no Urban VIII variant text found for this
+# one in the reference engine, unlike Iste Confessor's).
+id: lauds-hymn-common-of-a-martyr-bishop
+text:
+  la: >-
+    Martyr Dei, qui únicum
+
+    Patris sequéndo Fílium,
+
+    Victis triúmphas hóstibus,
+
+    Victor fruens cæléstibus.
+
+
+    Tui precátus múnere
+
+    Nostrum reátum dílue,
+
+    Arcens mali contágium,
+
+    Vitæ rémovens tǽdium.
+
+
+    Solúta sunt jam víncula
+
+    Tui sacráti córporis:
+
+    Nos solve vinclis sǽculi,
+
+    Amóre Fílii Dei.
+
+
+    Deo Patri sit glória,
+
+    Ejúsque soli Fílio,
+
+    Cum Spíritu Paráclito,
+
+    Et nunc, et in perpétuum. Amen.
+  en: >-
+    Martyr of God, whose strength was steeled
+
+    To follow close God's only Son,
+
+    Well didst thou brave thy battlefield,
+
+    And well thy heavenly bliss was won!
+
+
+    Now join thy prayers with ours, who pray
+
+    That God may pardon us and bless;
+
+    For prayer keeps evil's plague away,
+
+    And draws from life its weariness.
+
+
+    Long, long ago, were loosed the chains
+
+    That held thy body once in thrall;
+
+    For us how many a bond remains!
+
+    O love of God release us all.
+
+
+    All praise to God the Father be,
+
+    All praise to thee, Eternal Son;
+
+    All praise, O Holy Ghost, to thee,
+
+    While never-ending ages run. Amen.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/lauds-hymn-common-of-a-martyr.yml b/src/data/propers/common/lauds-hymn-common-of-a-martyr.yml
new file mode 100644
index 0000000..2ba6328
--- /dev/null
+++ b/src/data/propers/common/lauds-hymn-common-of-a-martyr.yml
@@ -0,0 +1,81 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2` live query, 2026-08 -- see lauds-capitulum-common-of-a-
+# martyr-bishop.yml's header for why the votive-office view was used.
+# "Martyr Dei, qui únicum" -- the classic Common-of-a-Martyr Lauds hymn,
+# a single genuine recension (no Urban VIII variant text found for this
+# one in the reference engine, unlike Iste Confessor's).
+id: lauds-hymn-common-of-a-martyr
+text:
+  la: >-
+    Martyr Dei, qui únicum
+
+    Patris sequéndo Fílium,
+
+    Victis triúmphas hóstibus,
+
+    Victor fruens cæléstibus.
+
+
+    Tui precátus múnere
+
+    Nostrum reátum dílue,
+
+    Arcens mali contágium,
+
+    Vitæ rémovens tǽdium.
+
+
+    Solúta sunt jam víncula
+
+    Tui sacráti córporis:
+
+    Nos solve vinclis sǽculi,
+
+    Amóre Fílii Dei.
+
+
+    Deo Patri sit glória,
+
+    Ejúsque soli Fílio,
+
+    Cum Spíritu Paráclito,
+
+    Et nunc, et in perpétuum. Amen.
+  en: >-
+    Martyr of God, whose strength was steeled
+
+    To follow close God's only Son,
+
+    Well didst thou brave thy battlefield,
+
+    And well thy heavenly bliss was won!
+
+
+    Now join thy prayers with ours, who pray
+
+    That God may pardon us and bless;
+
+    For prayer keeps evil's plague away,
+
+    And draws from life its weariness.
+
+
+    Long, long ago, were loosed the chains
+
+    That held thy body once in thrall;
+
+    For us how many a bond remains!
+
+    O love of God release us all.
+
+
+    All praise to God the Father be,
+
+    All praise to thee, Eternal Son;
+
+    All praise, O Holy Ghost, to thee,
+
+    While never-ending ages run. Amen.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/lauds-responsory-common-of-a-martyr-bishop.yml b/src/data/propers/common/lauds-responsory-common-of-a-martyr-bishop.yml
new file mode 100644
index 0000000..e3e4fe3
--- /dev/null
+++ b/src/data/propers/common/lauds-responsory-common-of-a-martyr-bishop.yml
@@ -0,0 +1,22 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2b` live query, 2026-08 -- see lauds-capitulum-common-of-a-
+# martyr-bishop.yml's header for why the votive-office view was used.
+id: lauds-responsory-common-of-a-martyr-bishop
+text:
+  la: |
+    R.br. Glória et honóre * Coronásti eum, Dómine.
+    ℟. Glória et honóre * Coronásti eum, Dómine.
+    ℣. Et constituísti eum super ópera mánuum tuárum.
+    ℟. Coronásti eum, Dómine.
+    ℣. Glória Patri, et Fílio, * et Spirítui Sancto.
+    ℟. Glória et honóre * Coronásti eum, Dómine.
+  en: |
+    R.br. Thou hast crowned him * with glory and honour, O Lord.
+    ℟. Thou hast crowned him * with glory and honour, O Lord.
+    ℣. And madest him to have dominion over the works of thy hands.
+    ℟. With glory and honour, O Lord.
+    ℣. Glory be to the Father, and to the Son, * and to the Holy Ghost.
+    ℟. Thou hast crowned him * with glory and honour, O Lord.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/lauds-responsory-common-of-a-martyr.yml b/src/data/propers/common/lauds-responsory-common-of-a-martyr.yml
new file mode 100644
index 0000000..2b60eac
--- /dev/null
+++ b/src/data/propers/common/lauds-responsory-common-of-a-martyr.yml
@@ -0,0 +1,22 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2` live query, 2026-08 -- see lauds-capitulum-common-of-a-
+# martyr-bishop.yml's header for why the votive-office view was used.
+id: lauds-responsory-common-of-a-martyr
+text:
+  la: |
+    R.br. Glória et honóre * Coronásti eum, Dómine.
+    ℟. Glória et honóre * Coronásti eum, Dómine.
+    ℣. Et constituísti eum super ópera mánuum tuárum.
+    ℟. Coronásti eum, Dómine.
+    ℣. Glória Patri, et Fílio, * et Spirítui Sancto.
+    ℟. Glória et honóre * Coronásti eum, Dómine.
+  en: |
+    R.br. Thou hast crowned him * with glory and honour, O Lord.
+    ℟. Thou hast crowned him * with glory and honour, O Lord.
+    ℣. And madest him to have dominion over the works of thy hands.
+    ℟. With glory and honour, O Lord.
+    ℣. Glory be to the Father, and to the Son, * and to the Holy Ghost.
+    ℟. Thou hast crowned him * with glory and honour, O Lord.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/lauds-versicle-common-of-a-martyr-bishop.yml b/src/data/propers/common/lauds-versicle-common-of-a-martyr-bishop.yml
new file mode 100644
index 0000000..030fd6e
--- /dev/null
+++ b/src/data/propers/common/lauds-versicle-common-of-a-martyr-bishop.yml
@@ -0,0 +1,16 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2b` live query, 2026-08 -- see lauds-capitulum-common-of-a-
+# martyr-bishop.yml's header for why the votive-office view was used.
+# Same versicle as Vespers -- see vespers-versicle-common-of-a-martyr-
+# bishop.yml's header.
+id: lauds-versicle-common-of-a-martyr-bishop
+text:
+  la: |
+    ℣. Justus ut palma florébit.
+    ℟. Sicut cedrus Líbani multiplicábitur.
+  en: |
+    ℣. The righteous shall flourish like the palm-tree.
+    ℟. He shall grow like a cedar in Lebanon.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/lauds-versicle-common-of-a-martyr.yml b/src/data/propers/common/lauds-versicle-common-of-a-martyr.yml
new file mode 100644
index 0000000..f516461
--- /dev/null
+++ b/src/data/propers/common/lauds-versicle-common-of-a-martyr.yml
@@ -0,0 +1,16 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# `votive=C2` live query, 2026-08 -- see lauds-capitulum-common-of-a-
+# martyr-bishop.yml's header for why the votive-office view was used.
+# Same versicle as Vespers -- see vespers-versicle-common-of-a-martyr-
+# bishop.yml's header.
+id: lauds-versicle-common-of-a-martyr
+text:
+  la: |
+    ℣. Justus ut palma florébit.
+    ℟. Sicut cedrus Líbani multiplicábitur.
+  en: |
+    ℣. The righteous shall flourish like the palm-tree.
+    ℟. He shall grow like a cedar in Lebanon.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/vespers-hymn-common-of-a-martyr-bishop.yml b/src/data/propers/common/vespers-hymn-common-of-a-martyr-bishop.yml
new file mode 100644
index 0000000..d68841b
--- /dev/null
+++ b/src/data/propers/common/vespers-hymn-common-of-a-martyr-bishop.yml
@@ -0,0 +1,115 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C2b` live query, 2026-08 -- the classic "Deus tuórum mílitum"
+# Common-of-a-Martyr Vespers hymn, previously entirely missing from this
+# app (no `vespers-hymn-common-of-a-martyr-bishop.yml`/`-common-of-a-
+# martyr.yml` at all), so any Vespers/Compline landing on an unauthored
+# Common-of-a-Martyr(-Bishop) saint fell all the way through to the plain
+# ferial default -- the gap this app's user flagged live, on St.
+# Zephyrinus's own Aug 26/25 evening (see calendar/vespers.ts's First-
+# Vespers-anticipation comments for that saint's own history). Bypasses
+# calendar concurrence entirely, same reasoning as Common-of-a-Confessor-
+# Not-Bishop's own Vespers file (see its header): no real Common-of-a-
+# Martyr(-Bishop) saint's own Second Vespers is ever un-outranked on this
+# app's merged calendar -- every real candidate either has proper content
+# of his own (St. Lawrence, St. Stephen) or never reaches the rank needed
+# to keep his own evening (St. Zephyrinus, St. Callistus both Simplex/
+# plain Duplex). Byte-identical to `votive=C2`/`C2a` (plain Common of a
+# Martyr), confirming TODO.md's earlier Matins-psalmody finding
+# (`common-of-a-martyr-bishop` and `common-of-a-martyr` share real
+# content) extends to this bundle too -- authored as two separate files
+# rather than an alias redirect only because this bundle's lookup
+# (`resolveOfficeBundle`) has no alias mechanism the way the Matins-
+# psalmody category tier does.
+id: vespers-hymn-common-of-a-martyr-bishop
+text:
+  la: >-
+    Deus tuórum mílitum
+
+    Sors, et córona, prǽmium,
+
+    Laudes canéntes Mártyris
+
+    Absólve nexu críminis.
+
+
+    Hic nempe mundi gáudia,
+
+    Et blandiménta nóxia
+
+    Cadúca rite députans,
+
+    Pervénit ad cæléstia.
+
+
+    Pœnas cucúrrit fórtiter,
+
+    Et sústulit viríliter,
+
+    Pro te effúndens sánguinem,
+
+    Ætérna dona póssidet.
+
+
+    Ob hoc precátu súpplici
+
+    Te póscimus, piíssime;
+
+    In hoc triúmpho Mártyris
+
+    Dimítte noxam sérvulis.
+
+
+    Laus et perénnis glória
+
+    Deo Patri, et Fílio,
+
+    Sancto simul Paráclito,
+
+    In sempitérna sǽcula. Amen.
+  en: >-
+    O God, of those that fought thy fight,
+
+    Portion, and prize, and crown of light,
+
+    Break every bond of sin and shame
+
+    As now we praise thy martyr's name.
+
+
+    He recked not of the world's allure,
+
+    But sin and pomp of sin forswore:
+
+    Knew all their gall, and passed them by,
+
+    And reached the throne prepared on high.
+
+
+    Bravely the course of pain he ran,
+
+    And bare his torments as a man:
+
+    For love of thee his blood outpoured,
+
+    And thus obtained the great reward.
+
+
+    With humble voice and suppliant word
+
+    We pray thee therefore, holy Lord,
+
+    While we thy martyr's feast-day keep,
+
+    Forgive thy loved and erring sheep.
+
+
+    Glory and praise for aye be done
+
+    To God the Father, and the Son,
+
+    And Holy Ghost, who reign on high,
+
+    One God, to all eternity. Amen.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/vespers-hymn-common-of-a-martyr.yml b/src/data/propers/common/vespers-hymn-common-of-a-martyr.yml
new file mode 100644
index 0000000..5291556
--- /dev/null
+++ b/src/data/propers/common/vespers-hymn-common-of-a-martyr.yml
@@ -0,0 +1,103 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C2` live query, 2026-08 -- the classic "Deus tuórum mílitum"
+# Common-of-a-Martyr Vespers hymn, byte-identical to `votive=C2b` (Common
+# of a Martyr Bishop) -- see vespers-hymn-common-of-a-martyr-bishop.yml's
+# header for the fuller gap/sourcing writeup (the bug report that
+# surfaced this, why the votive-office view was used instead of a real
+# saint's day, and why this is a separate file rather than an alias
+# redirect). Duplicated verbatim into this plain `common-of-a-martyr` id
+# for St. Hadrian/St. Hermes/St. Fidelis of Sigmaringen, who use it
+# directly (not the `-bishop` id).
+id: vespers-hymn-common-of-a-martyr
+text:
+  la: >-
+    Deus tuórum mílitum
+
+    Sors, et córona, prǽmium,
+
+    Laudes canéntes Mártyris
+
+    Absólve nexu críminis.
+
+
+    Hic nempe mundi gáudia,
+
+    Et blandiménta nóxia
+
+    Cadúca rite députans,
+
+    Pervénit ad cæléstia.
+
+
+    Pœnas cucúrrit fórtiter,
+
+    Et sústulit viríliter,
+
+    Pro te effúndens sánguinem,
+
+    Ætérna dona póssidet.
+
+
+    Ob hoc precátu súpplici
+
+    Te póscimus, piíssime;
+
+    In hoc triúmpho Mártyris
+
+    Dimítte noxam sérvulis.
+
+
+    Laus et perénnis glória
+
+    Deo Patri, et Fílio,
+
+    Sancto simul Paráclito,
+
+    In sempitérna sǽcula. Amen.
+  en: >-
+    O God, of those that fought thy fight,
+
+    Portion, and prize, and crown of light,
+
+    Break every bond of sin and shame
+
+    As now we praise thy martyr's name.
+
+
+    He recked not of the world's allure,
+
+    But sin and pomp of sin forswore:
+
+    Knew all their gall, and passed them by,
+
+    And reached the throne prepared on high.
+
+
+    Bravely the course of pain he ran,
+
+    And bare his torments as a man:
+
+    For love of thee his blood outpoured,
+
+    And thus obtained the great reward.
+
+
+    With humble voice and suppliant word
+
+    We pray thee therefore, holy Lord,
+
+    While we thy martyr's feast-day keep,
+
+    Forgive thy loved and erring sheep.
+
+
+    Glory and praise for aye be done
+
+    To God the Father, and the Son,
+
+    And Holy Ghost, who reign on high,
+
+    One God, to all eternity. Amen.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/vespers-responsory-common-of-a-martyr-bishop.yml b/src/data/propers/common/vespers-responsory-common-of-a-martyr-bishop.yml
new file mode 100644
index 0000000..438c4bd
--- /dev/null
+++ b/src/data/propers/common/vespers-responsory-common-of-a-martyr-bishop.yml
@@ -0,0 +1,23 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C2b` live query, 2026-08 -- see vespers-hymn-common-of-a-martyr-
+# bishop.yml's header for why the votive-office view was used instead of
+# a real saint's own day.
+id: vespers-responsory-common-of-a-martyr-bishop
+text:
+  la: |
+    R.br. Posuísti, Dómine, * Super caput ejus.
+    ℟. Posuísti, Dómine, * Super caput ejus.
+    ℣. Corónam de lápide pretióso.
+    ℟. Super caput ejus.
+    ℣. Glória Patri, et Fílio, * et Spirítui Sancto.
+    ℟. Posuísti, Dómine, * Super caput ejus.
+  en: |
+    R.br. O Lord, Thou hast set * Upon his head.
+    ℟. O Lord, Thou hast set * Upon his head.
+    ℣. A Crown of precious stones.
+    ℟. Upon his head.
+    ℣. Glory be to the Father, and to the Son, * and to the Holy Ghost.
+    ℟. O Lord, Thou hast set * Upon his head.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/vespers-responsory-common-of-a-martyr.yml b/src/data/propers/common/vespers-responsory-common-of-a-martyr.yml
new file mode 100644
index 0000000..002a7d1
--- /dev/null
+++ b/src/data/propers/common/vespers-responsory-common-of-a-martyr.yml
@@ -0,0 +1,23 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C2` live query, 2026-08 -- see vespers-hymn-common-of-a-martyr-
+# bishop.yml's header for why the votive-office view was used instead of
+# a real saint's own day.
+id: vespers-responsory-common-of-a-martyr
+text:
+  la: |
+    R.br. Posuísti, Dómine, * Super caput ejus.
+    ℟. Posuísti, Dómine, * Super caput ejus.
+    ℣. Corónam de lápide pretióso.
+    ℟. Super caput ejus.
+    ℣. Glória Patri, et Fílio, * et Spirítui Sancto.
+    ℟. Posuísti, Dómine, * Super caput ejus.
+  en: |
+    R.br. O Lord, Thou hast set * Upon his head.
+    ℟. O Lord, Thou hast set * Upon his head.
+    ℣. A Crown of precious stones.
+    ℟. Upon his head.
+    ℣. Glory be to the Father, and to the Son, * and to the Holy Ghost.
+    ℟. O Lord, Thou hast set * Upon his head.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/vespers-versicle-common-of-a-martyr-bishop.yml b/src/data/propers/common/vespers-versicle-common-of-a-martyr-bishop.yml
new file mode 100644
index 0000000..5da6a0b
--- /dev/null
+++ b/src/data/propers/common/vespers-versicle-common-of-a-martyr-bishop.yml
@@ -0,0 +1,14 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C2b` live query, 2026-08 -- same versicle as Lauds (see lauds-
+# versicle-common-of-a-martyr-bishop.yml).
+id: vespers-versicle-common-of-a-martyr-bishop
+text:
+  la: |
+    ℣. Justus ut palma florébit.
+    ℟. Sicut cedrus Líbani multiplicábitur.
+  en: |
+    ℣. The righteous shall flourish like the palm-tree.
+    ℟. He shall grow like a cedar in Lebanon.
+status:
+  la: verified
+  en: verified
diff --git a/src/data/propers/common/vespers-versicle-common-of-a-martyr.yml b/src/data/propers/common/vespers-versicle-common-of-a-martyr.yml
new file mode 100644
index 0000000..2ec60b4
--- /dev/null
+++ b/src/data/propers/common/vespers-versicle-common-of-a-martyr.yml
@@ -0,0 +1,14 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C2` live query, 2026-08 -- same versicle as Lauds (see lauds-
+# versicle-common-of-a-martyr.yml).
+id: vespers-versicle-common-of-a-martyr
+text:
+  la: |
+    ℣. Justus ut palma florébit.
+    ℟. Sicut cedrus Líbani multiplicábitur.
+  en: |
+    ℣. The righteous shall flourish like the palm-tree.
+    ℟. He shall grow like a cedar in Lebanon.
+status:
+  la: verified
+  en: verified
diff --git a/tests/hours/lauds.test.ts b/tests/hours/lauds.test.ts
index c113849..7abeaa4 100644
--- a/tests/hours/lauds.test.ts
+++ b/tests/hours/lauds.test.ts
@@ -157,6 +157,19 @@ describe('resolveOrdo("lauds", ...)', () => {
     expect(canticle?.kind === 'canticle' ? canticle.antiphon?.text.la : undefined).toContain('In cratícula');
   });
 
+  it("uses Common-of-a-Martyr-Bishop's real office bundle on St. Zephyrinus's own day, not the ferial default", () => {
+    // St. Zephyrinus (Aug 26, Simplex, common-of-a-martyr-bishop) has no
+    // proper Lauds content of his own; before this Common's Lauds bundle
+    // was authored, the missing chapter made the whole bundle resolve to
+    // undefined and fall through to the plain ferial default -- see
+    // lauds-hymn-common-of-a-martyr-bishop.yml's header.
+    const ordo = resolveOrdo('lauds', '2026-08-26');
+    const chapter = ordo.parts.find((p) => p.kind === 'chapter');
+    expect(chapter?.kind === 'chapter' ? chapter.text.citation?.en : undefined).toBe('Jas 1:12');
+    const hymn = ordo.parts.find((p) => p.kind === 'hymn');
+    expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Martyr Dei, qui únicum');
+  });
+
   it('includes the Kyrie + Our Father lead-in right after the Benedictus, before the day collect (either form)', () => {
     const ordo = resolveOrdo('lauds', FERIAL_TUESDAY);
     const litanyIndex = ordo.parts.findIndex((p) => p.kind === 'preces' && p.text.text.la?.includes('Kýrie, eléison'));
diff --git a/tests/hours/vespers.test.ts b/tests/hours/vespers.test.ts
index 869aa36..fa3faad 100644
--- a/tests/hours/vespers.test.ts
+++ b/tests/hours/vespers.test.ts
@@ -198,14 +198,42 @@ describe('resolveOrdo("vespers", ...)', () => {
   });
 
   it("renders Lent's seasonal office", () => {
-    // 2026-03-03 is a Tuesday in Lent, before Passiontide.
-    const ordo = resolveOrdo('vespers', '2026-03-03');
+    // 2026-03-02 is a Monday in Lent, before Passiontide -- deliberately
+    // not 03-03, whose own evening (as of the Common-of-a-Martyr-Bishop
+    // office-bundle authoring below) now correctly anticipates St. Lucius
+    // I's First Vespers on 03-04 instead of falling through to this
+    // seasonal default; 03-02's own evening has no adjacent sanctoral
+    // saint at all, so it stays a clean plain-Lent proof.
+    const ordo = resolveOrdo('vespers', '2026-03-02');
     const chapter = ordo.parts.find((p) => p.kind === 'chapter');
     expect(chapter?.kind === 'chapter' ? chapter.text.citation?.en : undefined).toBe('Joel 2:17');
     const hymn = ordo.parts.find((p) => p.kind === 'hymn');
     expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Audi, benígne Cónditor');
   });
 
+  it("uses Common-of-a-Martyr-Bishop's real office bundle, not the ferial default, for a Simplex saint's First Vespers", () => {
+    // St. Zephyrinus (Aug 26, Simplex, common-of-a-martyr-bishop) claims
+    // First Vespers over St. Louis's Aug 25 -- see calendar/vespers.ts's
+    // hasFirstVespers comments. Before this Common's Lauds/Vespers bundle
+    // was authored, the missing chapter/hymn made the whole bundle
+    // resolve to undefined, silently falling through to the plain ferial
+    // default -- live-verified against Divinum Officium's `votive=C2b`
+    // view instead of a real saint's own day, same reasoning as Common-
+    // of-a-Confessor-Not-Bishop's own proof (see vespers-hymn-common-of-
+    // a-martyr-bishop.yml's header).
+    const ordo = resolveOrdo('vespers', '2026-08-25');
+    const chapter = ordo.parts.find((p) => p.kind === 'chapter');
+    expect(chapter?.kind === 'chapter' ? chapter.text.citation?.en : undefined).toBe('Jas 1:12');
+    const hymn = ordo.parts.find((p) => p.kind === 'hymn');
+    expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Deus tuórum mílitum');
+    for (const part of ordo.parts) {
+      if (part.kind === 'chapter' || part.kind === 'responsory' || part.kind === 'hymn' || part.kind === 'versicle') {
+        expect(part.text.status.la).toBe('verified');
+        expect(part.text.status.en).toBe('verified');
+      }
+    }
+  });
+
   it("renders Passiontide's seasonal office, with the Gloria Patri omitted from the responsory", () => {
     // 2026-03-25 is a Wednesday in Passiontide (Passion Sunday 2026-03-22
     // through Holy Saturday 2026-04-04).