By 1597 the last metropolitan bishop of the Saint Thomas Christians, Abraham, had died, and Menezes was able to secure the submission of Archdeacon George, the highest remaining representative of the native church hierarchy.

Following the Synod, Menezes consecrated Francis Ros, S. J. as Archbishop of the Archdiocese of Angamalé for the Saint Thomas Christians.

Aleixo de Menezes, under the authority of the Goa Inquisition and the Council of Trent, continued the latinisation of the St. Thomas Christians started by the Portuguese in the early 16th century.

The Catholic Encyclopedia (1913) says: The only case in which an ancient Eastern rite has been wilfully romanized is that of the Malabar Christians, where it was not Roman authority but the misguided zeal of Alexius de Menezes, Archbishop of Goa, and his Portuguese advisers at the Synod of Diamper (1599) which spoiled the old Malabar Rite.Nasranis gathered at Mattancherry church on Friday, 3 January 1653 (M.E.

Francisco Ros bishop of Angamaly consecrated by Aleixo de Menesis, just after the Synod of Diamper, has mentioned in his letter to Padroado that Archbishop de Menesis added a few additional canons on his own to the Portuguese version of the decrees of Synod, which was submitted to Holy See after it ended.