(d. 642 AD)
Byzantine official. Bishop of Phasis in the Caucasus until 631, when he was named by Emperor Heraclius as prefect of Egypt and patriarch of Alexandria in opposition to the Coptic Church and its patriarch, Benjamin. He was entrusted with putting an end to dissension by enforcing orthodoxy in Egypt, and he attempted to carry out this policy with ruthless persecution of the Copts, though he was unsuccessful. Cyrus faced the Arabic invasion in 641 and was forced to agree by a treaty on 8 November 641 to surrender Alexandria and Egypt to the invaders and withdraw imperial forces the following year. He died in Alexandria on 21 March 642 before the end of Byzantine rule in the city.
Historical Dictionary Of Ancient Egypt by Morris L. Bierbrier
Ancient Egypt. A Reference Guide. EdwART. 2011.