In 431, the Council of Ephesus, which is reckoned as the third ecumenical council, condemned Nestorius and Nestorianism. That condemnation was consequently ignored by the East Syriac Church of the East, which had been previously established in the Sasanian Empire as a distinct Church at the Council of Seleucia-Ctesiphon in 410, and which at the Synod of Dadisho in 424 had declared the independence of its head, the Catholicos, in relation to "western" (Roman Empire) Church authorities. Even in its modern form of Assyrian Church of the East and Ancient Church of the East, it honours Nestorius as a teacher and saint.