It is celebrated 06.04.2026 according to the Julian calendar, or 19.04.2026 according to the Gregorian calendar. See what else we celebrate on that day here.
Venerable Gregory the Byzantine
Saint Gregory was a native of Constantinople, and pursued an ascetic life on Mt. Athos in the Lavra of St Athanasius (July 5). He was the spiritual guide of St Gregory Palamas (November 14).