During the Synod of Diamper of 1599, the Portuguese Archbishop, Don Alexis Menezes, succeeded in appointing a Latin bishop in the East Syrian Catholic ArchDiocese of Angamaly-Kodungallur to govern the St. Thomas Christians.
During the Synod of Diamper of 1599, the Portuguese Archbishop, Don Alexis Menezes, succeeded in bringing indigenous church under Catholic fold and formed a catholic diocese in Malabar. He appointed a Catholic bishop in the newly formed Catholic ArchDiocese of Angamaly-Kodungallur to govern the St. Thomas Christians.