Saint George's Day
Saint George's Day is celebrated on 23 April
https://en.wikipedia.org/wiki/Saint_George's_Day
THE ALPHABET OF WORDS IN THE DURHAM COLLECTAR AN EDITION WITH TWO NEW MANUSCRIPT WITNESSES
The earliest documented mention of St. George in England comes from the Catholic monk the venerable Bede (c. 673–735).[11] His feast day is also mentioned in the Durham Collectar, a ninth-century liturgical work.
https://www.jstor.org/stable/26421458