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==Biography==
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 [[Monophysitism|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.
