Changes

*410 The '''[[w:Council of Seleucia-Ctesiphon|Council of Seleucia-Ctesiphon]]''', also called the Council of Mar Isaac, met in AD 410 in Seleucia-Ctesiphon, capitol of the Sassanid Empire of Persia, extending official recognition to the Empire's Christian community, (known as the [[Assyrian Church of the East|Church of the East]] after 431 AD), and established the Bishop of Seleucia-Ctesiphon as its ''[[w:List of Patriarchs of the Church of the East|Catholicos]],'' or leader, declaring him to be supreme among the Bishops of the East; this established a hierarchical Christian Church in Iran, with a patriarchate at Ctesiphon and metropolitans in the capitals of five Persian provinces; it also declared its adherence to the decisions of the [[w:First Ecumenical Council|Council of Nicea]] and subscribed to the [[Nicene-Constantinopolitan Creed|Nicene Creed]].*424 '''Schism begun:''' Formal separation of the '''[[Assyrian Church of the East]]''' ("East Syrian Church", "Persian Church", "Chaldean Syrian Church", or "Nestorian Church"), from the [[Church of Antioch|See of Antioch]]: the '''Synod of Dadyeshu ''' met in Markabata of the Arabs, under the presidency of Mar Dadyeshu, proclaiming the independence of the Iranian Church from Byzantium, deciding that the ''Catholicos'' should be the sole head of the [[Assyrian Church of the East|Church of the East]] and that no ecclesiastical authority should be acknowledged above him, referring to him for the first time as ''Patriarch,'' answerable to God alone (thus also reassuring the Sassandid monarchy that Persian Christians were not influenced by the Roman enemy).