28 May 1964, Thursday (15.05 according to the old style)
Church calendar for 28 May 1964
Saints commemorated
- Hierarch Achillius of Larissa † ок. 330
- Hierarch Isaiah, Bishop of Rostov XI век — †15 мая 1090
- Venerable Euphrosynus of Pskov 1386 — 1481
- Venerable Hilary (Hilarion) of Galeata 476 — †15 мая 558
- Venerable Isaiah of the Kiev Caves, the Industrious XI век — 1115
- Venerable Pachomius the Great ок. 292 — ок. 346/348
- Venerable Serapion of Pskov, Spaso-Eleazarov XIV в. — 1480
- Right-Believing Tsarevich Right-Believing Tsarevich Demetrius of Uglich 19 октября 1582 — †15 мая 1591