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'''Cyrus of Alexandria''' was a [[Melchite]] patriarch of the
[[Egypt]]ian [[Patriarch of Alexandria|see of Alexandria]] in the [[seventh century ]], one of the authors of [[Monothelitism]] and last [[Byzantine Empire|Byzantine]] prefect of Egypt; died about [[641 ]].
He had been since
[[620 ]] Bishop of [[Phasis ]] in [[Colchis ]] when the [[Byzantine Emperor]] [[Heraclius]], in the course of his [[Byzantine-Persian Wars|Persian campaign]] of [[626 ]], consulted him about a plan for bringing the [[Monophysites]] (a Christological heresy) of Egypt back to the Church and to the support of the empire. The plan, suggested by Sergius, [[Patriarch of Constantinople]], consisted of confessing the [[Council of Chalcedon|faith of Chalcedon]] on the two natures of Christ, while practically nullifying it by the admission of one theandric will and operation, ''eu telèma kai mia energeia''. Cyrus hesitated at first, but being assured by Sergius that this formula was opposed to neither [[Church Fathers|the Fathers]] nor to Chalcedon and was destined to achieve great results, he became a staunch supporter of it, and was, in return, raised by Heraclius to the then vacant see of [[ Alexandria]] in [[630 ]].
Once a patriarch, Cyrus set himself vigorously to effect the desired union. In a synod held at Alexandria, he proposed what is known as the ''klèrothoria'' or "Satisfactio", an agreement in nine articles, the seventh of which is a bold assertion of the Monothelite heresy. The Monophysites (Theodosians or Severians) welcomed the agreement but remarked that Chalcedon was coming to them, not they to Chalcedon.
The union thus effected was adroitly exploited, with a view to win over [[Pope Honorius I]] to Monothelism. Cyrus attended another synod at Cyprus under [[Arkadios II]], at which he served as moderator and permitted Monothelite opponents to submit their case to the Emperor. When Cyrus received the Emperor's Monothelite response, the [[Ecthesis]], Cyrus signed it in 637. This compromise proved ineffective, and soon fell into discredit under the name of ''enoosis hydrobatès'', contemptuously called the "washy union".
[[Caliph Omar ]]'s general, [[Amru ]], threatened the Prefecture of Egypt, Cyrus was made prefect and entrusted with the conduct of the war. Certain humiliating stipulations, to which he subscribed for the sake of peace, angered his imperial master so much that he was recalled and harshly accused of connivance with the [[Islam|Muslims]]; however, he was soon restored to his former authority, owing to the impending siege of Alexandria, but could not avert the fall of the great city in [[640 ]] and died shortly after.