21 May 1964, Thursday (08.05 according to the old style)
Church calendar for 21 May 1964
Saints commemorated
- Apostle John I век, † ок. 101
- Venerable, Fool for Christ Arsenius of Novgorod, Fool for Christ XVI век — †12 июля 1570
- Venerable Arsenius the Great ок. 354 — ок. 449
- Venerable Arsenius the Laborious of the Kiev Caves кон. XIII — XIV век