Saint Theodore of Sykeon
Saint Theodore of Sykeon was a revered Byzantine ascetic, who lived between the first half of the 6th century and the thirteenth year of the Emperor Heraclius' rule (i. e. 623) in the early 7th century. His hagiography, written after 641, is a key primary source for the reign of Emperor Heraclius (r. 610–641). His feast day is April 22.