saints from his monastery on August 3. Peter the Great of Russia (reigned 1682–1725), whose birthday fell on Saint Isaac's feast day, May 30, adopted Isaac as the patron saint of the Romanov dynasty. Saint Isaac's Cathedral in the city of St Petersburg is consecrated to his honour. References External links Venerable Isaac the Founder of the Dalmatian Monastery at Constantinople Orthodox icon and synaxarion (May 30) Isaac, Dalmatus and Faustus, ascetics of the Dalmatian Monastery (August 3) 4th-century births 383 deaths Saints from Constantinople Saints from Roman Anatolia Greek Christian monks 4th-century Christian saints