After the First Council of Ephesus ( 431 ) -- the third Ecumenical Council -- the Church of Seleucia - Ctesiphon refused to condemn Nestorius .
Seleucia - Ctesiphon had hitherto been governed by a catholicos .
After the First Council of Ephesus ( 431 ) -- the third Ecumenical Council -- the Church of Seleucia - Ctesiphon , which had hitherto been governed by a catholicos , refused to condemn Nestorius .