sentences:  It was convened to address the Abrahamic tradition of circumcision and its relation to converted Gentiles (Acts 15).Its decisions are accepted by all Christians, and later definitions of an ecumenical council to conform to this sole Biblical council.The First seven Ecumenical Councils were held between 325 (the First Council of Nicaea) and 787 (the Second Council of Nicaea), which the Orthodox recognize as the definitive interpretation of Christian dogma.