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He had been since 620 Bishop of Phasis in Colchis when the [[Byzantine Emperor]] [[Heraclius]], in the course of his 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 I of Constantinople|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, ἔυ θέλημα καὶ μία ἐνέργεια (''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 πληροφορία (''plèrothoria'') 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 of Rome|Honorius I]] to Monothelism. Cyrus attended another synod at Cyprus under [[Arkadios Arcadius II of Cyprus|Arkadios Arcadius 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 ἔνωσις ὑδροβαφής (''enoosis hydrobatès''), contemptuously called the "washy union."
When 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.
From Cyrus we have three letters to Sergius and the "Satisfactio," all preserved in the acts of the Roman Synod of the Lateran and of the [[Sixth Ecumenical Council]] ([[w:Giovanni Domenico Mansi|Mansi]], X, 1004; XI, 560, 562, 964).
The first letter is an acceptation of the Ecthesis; in the second Cyrus describes his perplexity between Pope [[Leo I of Romethe Great|Leo]] and Sergius; the conversion of the Theodosians is narrated in the third.
The seventh article of the "Satisfactio"—the others are irrelevant—reads thus: "The one and same Christ, the Son, performs the works proper to God and to man by one theandric operation [μιᾴ θεανδρικῇ ένεργεία (''mia theandriki energia'')] according to St. Dionysius."
Cyrus' communications with Mohammad, the [[Prophet]] of [[Islam]], also survive to this day.<ref>[http://wamohammadah.maktoobblog.com/?post=265055 (Arabic)] and [[w:Muqawqis|''Muqawqis'' at Wikipedia]]</ref> Cyrus offered Maria, a Coptic girl, as a gift to Prophet Mohammad.<ref>[[w:Maria_al-Qibtiyya|''Maria al-Qibtiyya'' at Wikipedia]]</ref>
Cyrus was posthumously condemned as a heretic in the [[Lateran Council ]] of 649 ([[w:Heinrich Joseph Dominicus Denzinger|Denzinger]], Enchiridion, 217, 219) and in 680 at the Sixth Ecumenical Council (Denzinger, 238; Mansi, XI, 554) together with Pope Honorius and Sergius, [[Pyrrhus I of Constantinople|Pyrrhus]], [[Paul II of Constantinople|Paul]], and [[Peter of Constantinople|Peter]], Patriarchs of Constantinople from 610 to 666.<ref>''The Seven Ecumenical Councils: The Sixth Ecumenical Council. The Third Council of Constantinople. [http://www.ccel.org/ccel/schaff/npnf214.xiii.viii.html The Sentence Against the Monothelites. Session XIII.]'' from the Christian Classics Ethereal Library</ref>
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title=Bishop of Phasis|
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[[Category:Bishops]]
[[Category:7th-century bishops]]
[[Category:Heretics]]
[[Category:Patriarchs of Alexandria]]
