Isaac of Dalmatia
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Saint Isaac of Dalmatia (died May 30, 383) was a Byzantine monk who was imprisoned for denouncing the Roman emperor Valens for the heresy of Arianism and predicting[citation needed] that Valens would "die in flames" because of his actions. Soon after, Valens went to war with the Goths but was defeated and died in a fire after taking refuge in a barn[citation needed]. Valens' successor Theodosius I released Isaac, outlawed Arianism and reopened the Catholic churches closed by Valens. Isaac returned to monastic life and founded a monastery in Constantinople, where he died on May 30, 383.
He was adopted as the patron saint of the Romanov dynasty by Peter the Great of Russia, whose birthday fell on Saint Isaac's feast day, May 30. He is commemorated by Saint Isaac's Cathedral in the city of St Petersburg.