diff --git a/src/data/calendar/sanctoral-calendar.yml b/src/data/calendar/sanctoral-calendar.yml
index a823b87..60a87fc 100644
--- a/src/data/calendar/sanctoral-calendar.yml
+++ b/src/data/calendar/sanctoral-calendar.yml
@@ -315,7 +315,6 @@ days:
   # Michaelmas. Kept mapped here anyway as a deliberate, informed
   # simplification (explicit user decision, 2026-08), not an oversight --
   # see st-michael.yml.
-  "09-01": [st-giles, ss-twelve-brothers]
   "09-02": [st-stephen-of-hungary]
   "09-03": [st-pius-x]
   "09-05": [st-lawrence-justinian]