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Saint Crispin's Day falls on 25 October and is the feast day of the Christian saints Crispin and Crispinian (also known as Crispinus and Crispianus, though this spelling has fallen out of favour), twins who were martyred circa A.D. 286. It is a day most famous for the battles that occurred on it: the Battle of Agincourt in 1415, the Battle of Balaklava (Charge of the Light Brigade) during the Crimean War in 1854 and the Battle of Leyte Gulf in the Pacific theater in 1944. The Battle of Agincourt was dramatised by William Shakespeare in Henry V featuring the St. Crispin's Day Speech in which Henry inspired his much outnumbered English forces to fight the French saying "the fewer men, the greater share of honour."
The feast day of Saints Crispin and Crispinian is October 25. However, these saints were removed from the liturgical calendar (but not declared to no longer be saints) during the Catholic Church's Vatican II reforms. The feast remains as a 'Black Letter Saints' Day' in the Calendar of the Anglican Book of Common Prayer (1662) and a 'commemoration' in Common Worship (2000). The reasoning used by Vatican II for this decision was that there was insufficient evidence that Saints Crispin and Crispinian actually existed.