diff --git a/src/data/calendar/saints/nativity-bvm.yml b/src/data/calendar/saints/nativity-bvm.yml
index 9666bbc..a41d1d6 100644
--- a/src/data/calendar/saints/nativity-bvm.yml
+++ b/src/data/calendar/saints/nativity-bvm.yml
@@ -1,7 +1,10 @@
 # Verified against Divinum Officium (web/www/horas/Latin/Sancti/09-08.txt,
-# untagged/default [Rank] block).
+# untagged/default [Rank] block). Propers backfilled during the September
+# pull (live kalendar/prayTertia check, 2025-09-08) now that the
+# collect-pulling methodology exists -- own proper collect and antiphon;
+# wins outright over the stub St. Hadrian (see st-hadrian.yml).
 id: nativity-bvm
 name: "The Nativity of the Blessed Virgin Mary"
 rank: duplex-2-classis
 common: common-of-the-bvm
-propers: null
+propers: "nativity-bvm"
diff --git a/src/data/calendar/saints/ss-cornelius-and-cyprian.yml b/src/data/calendar/saints/ss-cornelius-and-cyprian.yml
new file mode 100644
index 0000000..dc974a4
--- /dev/null
+++ b/src/data/calendar/saints/ss-cornelius-and-cyprian.yml
@@ -0,0 +1,13 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2025-09-16, 2026-09-16) -- winner outright, Semiduplex,
+# over the stub Ss. Euphemia, Lucy, and Geminianus (see
+# ss-euphemia-lucia-and-geminianus.yml). In years where Sep 16 itself
+# falls on the movable September Ember Wednesday, that Ember day is
+# commemorated instead of Euphemia et al. (confirmed 2026) -- doesn't
+# change this saint's own outright win either way. No unique collect: the
+# raw file at this MM-DD slot (Sancti/09-16.txt) is empty.
+id: ss-cornelius-and-cyprian
+name: "Ss. Cornelius, Pope, and Cyprian, Bishop, Martyrs"
+rank: semiduplex
+common: common-of-several-martyrs
+propers: null
diff --git a/src/data/calendar/saints/ss-cosmas-and-damian.yml b/src/data/calendar/saints/ss-cosmas-and-damian.yml
new file mode 100644
index 0000000..1099e73
--- /dev/null
+++ b/src/data/calendar/saints/ss-cosmas-and-damian.yml
@@ -0,0 +1,8 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2025-09-27) -- winner outright, Semiduplex, alone. Own
+# proper collect, no unique antiphon of their own.
+id: ss-cosmas-and-damian
+name: "Ss. Cosmas and Damian, Martyrs"
+rank: semiduplex
+common: common-of-several-martyrs
+propers: "ss-cosmas-and-damian"
diff --git a/src/data/calendar/saints/ss-cyprian-and-justina.yml b/src/data/calendar/saints/ss-cyprian-and-justina.yml
new file mode 100644
index 0000000..640bf8c
--- /dev/null
+++ b/src/data/calendar/saints/ss-cyprian-and-justina.yml
@@ -0,0 +1,11 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2025-09-26) -- winner outright, Simplex, alone. Own
+# proper collect, no unique antiphon of their own. A different St.
+# Cyprian than the Sep 16 St. Cornelius's companion (see
+# ss-cornelius-and-cyprian.yml) -- this Cyprian is paired with St.
+# Justina instead, a distinct legend.
+id: ss-cyprian-and-justina
+name: "Ss. Cyprian and Justina, Martyrs"
+rank: simplex
+common: common-of-several-martyrs
+propers: "ss-cyprian-and-justina"
diff --git a/src/data/calendar/saints/ss-euphemia-lucia-and-geminianus.yml b/src/data/calendar/saints/ss-euphemia-lucia-and-geminianus.yml
new file mode 100644
index 0000000..bb8dc61
--- /dev/null
+++ b/src/data/calendar/saints/ss-euphemia-lucia-and-geminianus.yml
@@ -0,0 +1,15 @@
+# Genuinely unwinnable stub (verified 2025-09-16, a non-Ember year) --
+# always commemorated under Ss. Cornelius and Cyprian (see
+# ss-cornelius-and-cyprian.yml), never wins outright; both are fixed,
+# non-movable dates, so this isn't an artifact of the tested year. In
+# years where Sep 16 lands on the movable September Ember Wednesday
+# instead (confirmed 2026), this saint doesn't even surface as a
+# commemoration at all -- the Ember day takes that slot -- but that's a
+# separate, already-modeled temporal interaction (privileged-feria),
+# not a change to this saint's own standing. rank/propers unverified
+# placeholders.
+id: ss-euphemia-lucia-and-geminianus
+name: "Ss. Euphemia, Lucy, and Geminianus, Martyrs"
+rank: simplex
+common: common-of-several-martyrs
+propers: null
diff --git a/src/data/calendar/saints/ss-maurice-and-companions.yml b/src/data/calendar/saints/ss-maurice-and-companions.yml
new file mode 100644
index 0000000..5ba3b24
--- /dev/null
+++ b/src/data/calendar/saints/ss-maurice-and-companions.yml
@@ -0,0 +1,13 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2025-09-22) -- winner outright, Simplex, alone. No
+# unique collect: the raw file at this MM-DD slot (Sancti/09-22.txt) is
+# actually St. Thomas of Villanova's, a Bishop (a later, post-1617
+# addition to this filename slot, canonized 1658) -- a live prayTertia
+# query for the Monastic 1617 track returns no Oratio at all, confirming
+# propers: null is correct, same file-naming caution as several of
+# August's entries.
+id: ss-maurice-and-companions
+name: "Ss. Maurice and Companions, Martyrs"
+rank: simplex
+common: common-of-several-martyrs
+propers: null
diff --git a/src/data/calendar/saints/ss-twelve-brothers.yml b/src/data/calendar/saints/ss-twelve-brothers.yml
new file mode 100644
index 0000000..fe4f153
--- /dev/null
+++ b/src/data/calendar/saints/ss-twelve-brothers.yml
@@ -0,0 +1,9 @@
+# Genuinely unwinnable stub (verified 2025-09-01, 2026-09-01) -- always
+# commemorated under St. Giles (see st-giles.yml), never wins outright;
+# both are fixed, non-movable dates, so this isn't an artifact of the
+# tested year. rank/propers unverified placeholders.
+id: ss-twelve-brothers
+name: "Ss. Twelve Brothers, Martyrs"
+rank: simplex
+common: common-of-several-martyrs
+propers: null
diff --git a/src/data/calendar/saints/st-giles.yml b/src/data/calendar/saints/st-giles.yml
new file mode 100644
index 0000000..f02ca62
--- /dev/null
+++ b/src/data/calendar/saints/st-giles.yml
@@ -0,0 +1,10 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2025-09-01, 2026-09-01) -- winner outright, Simplex,
+# over the stub Ss. Twelve Brothers (see ss-twelve-brothers.yml). No
+# unique collect: the raw file at this MM-DD slot (Sancti/09-01.txt) is
+# empty.
+id: st-giles
+name: "St. Giles, Abbot"
+rank: simplex
+common: common-of-an-abbot
+propers: null
diff --git a/src/data/calendar/saints/st-hadrian.yml b/src/data/calendar/saints/st-hadrian.yml
new file mode 100644
index 0000000..8a21861
--- /dev/null
+++ b/src/data/calendar/saints/st-hadrian.yml
@@ -0,0 +1,14 @@
+# Genuinely unwinnable stub (verified 2025-09-08, 2026-09-08) -- always
+# commemorated under the Nativity of the BVM (see nativity-bvm.yml),
+# never wins outright; both are fixed, non-movable dates, so this isn't
+# an artifact of the tested year. Unlike this month's several Nativity-
+# octave secondary saints (excluded entirely -- see the sanctoral-
+# calendar.yml comment on this month's octave-gap exclusions), this one
+# IS representable: the Nativity's own day (Sep 8) is already a normal
+# mapped sanctoral entry, so the collision engine resolves it correctly
+# without needing octave support. rank/propers unverified placeholders.
+id: st-hadrian
+name: "St. Hadrian, Martyr"
+rank: simplex
+common: common-of-a-martyr
+propers: null
diff --git a/src/data/calendar/saints/st-januarius.yml b/src/data/calendar/saints/st-januarius.yml
new file mode 100644
index 0000000..bb97d6a
--- /dev/null
+++ b/src/data/calendar/saints/st-januarius.yml
@@ -0,0 +1,11 @@
+# A monastic-calendar-specific addition: not present in the base Tridentine
+# table (1570.txt), added by the monastic-specific delta table
+# (M1617.txt). Verified live (Monastic Tridentinum 1617, 2025-09-19) --
+# winner outright, Semiduplex, alone (the only other candidate that day is
+# a September Ember Friday feria, not another saint). No unique collect:
+# the raw file at this MM-DD slot (Sancti/09-19.txt) is empty.
+id: st-januarius
+name: "St. Januarius, Bishop, and Companions, Martyrs"
+rank: semiduplex
+common: common-of-a-martyr-bishop
+propers: null
diff --git a/src/data/calendar/saints/st-jerome.yml b/src/data/calendar/saints/st-jerome.yml
new file mode 100644
index 0000000..7c60c59
--- /dev/null
+++ b/src/data/calendar/saints/st-jerome.yml
@@ -0,0 +1,8 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2025-09-30) -- winner outright, Duplex, alone. Own
+# proper collect, no unique antiphon of his own.
+id: st-jerome
+name: "St. Jerome, Priest, Confessor and Doctor of the Church"
+rank: duplex
+common: common-of-a-confessor-not-bishop
+propers: "st-jerome"
diff --git a/src/data/calendar/saints/st-linus.yml b/src/data/calendar/saints/st-linus.yml
new file mode 100644
index 0000000..b73aee7
--- /dev/null
+++ b/src/data/calendar/saints/st-linus.yml
@@ -0,0 +1,9 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2025-09-23, 2026-09-23) -- winner outright, Semiduplex,
+# over the stub St. Thecla (see st-thecla.yml). No unique collect: the
+# raw file at this MM-DD slot (Sancti/09-23.txt) is empty.
+id: st-linus
+name: "St. Linus, Pope and Martyr"
+rank: semiduplex
+common: common-of-a-martyr-bishop
+propers: null
diff --git a/src/data/calendar/saints/st-matthew.yml b/src/data/calendar/saints/st-matthew.yml
new file mode 100644
index 0000000..cefaff4
--- /dev/null
+++ b/src/data/calendar/saints/st-matthew.yml
@@ -0,0 +1,8 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), live
+# kalendar check (2026-09-21) -- winner outright, Duplex II. classis,
+# alone. Own proper collect, no unique antiphon of his own.
+id: st-matthew
+name: "St. Matthew, Apostle and Evangelist"
+rank: duplex-2-classis
+common: common-of-an-apostle
+propers: "st-matthew"
diff --git a/src/data/calendar/saints/st-nicholas-of-tolentino.yml b/src/data/calendar/saints/st-nicholas-of-tolentino.yml
new file mode 100644
index 0000000..dafaafe
--- /dev/null
+++ b/src/data/calendar/saints/st-nicholas-of-tolentino.yml
@@ -0,0 +1,15 @@
+# A monastic-calendar-specific reassignment, not a mistake: the base
+# Tridentine table (1570.txt) has Sep 10 as a plain continuation of the
+# Nativity of the BVM's octave, but the monastic-specific delta table
+# (M1617.txt) overrides that day entirely with this saint -- confirmed
+# live (Monastic Tridentinum 1617, 2025-09-10), winning outright at
+# Semiduplex, alone (the octave continuation is demoted to a mere
+# commemoration, itself not independently named so not modeled). Same
+# class of finding as April's St. Robert/St. Catherine reassignment. No
+# unique collect: the raw file at this MM-DD slot (Sancti/09-10.txt) is
+# empty.
+id: st-nicholas-of-tolentino
+name: "St. Nicholas of Tolentino, Confessor"
+rank: semiduplex
+common: common-of-a-confessor-not-bishop
+propers: null
diff --git a/src/data/calendar/saints/st-thecla.yml b/src/data/calendar/saints/st-thecla.yml
new file mode 100644
index 0000000..3a11514
--- /dev/null
+++ b/src/data/calendar/saints/st-thecla.yml
@@ -0,0 +1,9 @@
+# Genuinely unwinnable stub (verified 2025-09-23, 2026-09-23) -- always
+# commemorated under St. Linus (see st-linus.yml), never wins outright;
+# both are fixed, non-movable dates, so this isn't an artifact of the
+# tested year. rank/propers unverified placeholders.
+id: st-thecla
+name: "St. Thecla, Virgin and Martyr"
+rank: simplex
+common: common-of-a-virgin-martyr
+propers: null
diff --git a/src/data/calendar/saints/vigil-of-st-matthew.yml b/src/data/calendar/saints/vigil-of-st-matthew.yml
new file mode 100644
index 0000000..bd0df8b
--- /dev/null
+++ b/src/data/calendar/saints/vigil-of-st-matthew.yml
@@ -0,0 +1,17 @@
+# A real vigil. Sep 20 sometimes coincides with the movable September
+# Ember Saturday (privileged-feria, already modeled -- which specific
+# week in September Ember falls in shifts year to year, confirmed by
+# comparing 2025, where Sep 20 IS Ember Saturday, against 2026, where
+# Sep 20 is an ordinary Sunday instead). In the *real* engine, on an
+# Ember-Saturday year this vigil is commemorated Mass-only rather than
+# fully displaced (2025-09-20, live check) -- this app doesn't model that
+# Office-vs-Mass distinction anywhere, so here it simply transfers per the
+# ordinary privileged-feria/vigil rule instead, a known, already-accepted
+# simplification (not specific to this saint) rather than a guess. No
+# unique collect: the raw file at this MM-DD slot (Sancti/09-20.txt) is
+# empty.
+id: vigil-of-st-matthew
+name: "Vigil of St. Matthew"
+rank: vigil
+common: common-of-a-vigil
+propers: null
diff --git a/src/data/calendar/sanctoral-calendar.yml b/src/data/calendar/sanctoral-calendar.yml
index 04a29a0..1cef35d 100644
--- a/src/data/calendar/sanctoral-calendar.yml
+++ b/src/data/calendar/sanctoral-calendar.yml
@@ -191,7 +191,45 @@ days:
   "08-28": [st-augustine, st-hermes]
   "08-29": [decollation-of-st-john-baptist, st-sabina]
   "08-30": [ss-felix-and-adauctus]
-  "09-08": [nativity-bvm]
+  # September — 9/12 of the pre-1955 pull. Same octave-gap exclusions as
+  # August, this time around the Nativity of the BVM's own Sep 8-15
+  # octave: Ss. Gorgonius (Sep 9), Proti and Hyacinthus (Sep 11), and
+  # Nicomedes (Sep 15, the octave's own final day) are real named
+  # secondaries excluded for the same reason St. Clare was in August.
+  # St. Hadrian (Sep 8) is the one exception -- he's blocked by the
+  # Nativity's own day, not its octave, and that day IS already a mapped
+  # sanctoral entry, so the ordinary collision engine handles him
+  # correctly. The Exaltation of the Holy Cross (Sep 14) is excluded as a
+  # fixed feast of the Lord, same convention as the Finding of the Holy
+  # Cross. St. Nicholas of Tolentino (Sep 10) and St. Januarius (Sep 19)
+  # are both monastic-calendar-specific: the former overrides what the
+  # base Tridentine table treats as a plain Nativity-octave continuation,
+  # the latter is added outright, present in neither the base table nor
+  # (for Nicholas) its own octave slot.
+  #
+  # FLAGGED FOR REVIEW: the pre-existing "09-29": [st-michael] mapping
+  # below (added before this pull initiative, sourced from the raw
+  # Sancti/09-29.txt file directly rather than a live query) does not
+  # appear to hold in this pull's actual target track -- a live kalendar
+  # check across 6 different years (2025-2030) shows nothing at all on
+  # Sep 29 in "Monastic Tridentinum 1617" (not even a commemoration),
+  # and that file's own [Rank] block has no untagged/default entry for
+  # this date, only rubric-tagged alternates (tridentina, cisterciensis).
+  # The already-correctly-pulled May 8 Apparition of St. Michael (see
+  # apparition-of-st-michael.yml) may be this tradition's only real
+  # Michaelmas. Left as-is pending a decision -- see this month's summary.
+  "09-01": [st-giles, ss-twelve-brothers]
+  "09-08": [nativity-bvm, st-hadrian]
+  "09-10": [st-nicholas-of-tolentino]
+  "09-16": [ss-cornelius-and-cyprian, ss-euphemia-lucia-and-geminianus]
+  "09-19": [st-januarius]
+  "09-20": [vigil-of-st-matthew]
+  "09-21": [st-matthew]
+  "09-22": [ss-maurice-and-companions]
+  "09-23": [st-linus, st-thecla]
+  "09-26": [ss-cyprian-and-justina]
+  "09-27": [ss-cosmas-and-damian]
   "09-29": [st-michael]
+  "09-30": [st-jerome]
   "11-01": [all-saints]
   "12-08": [immaculate-conception]