The Catholicate office of Mor Baselios Thomas I functions at the Mor Ignatius Zakka I Centre in Puthencruz near Kochi, which is also the headquarters of the Syrian Orthodox Church in India.
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Catholicos Baselios Thomas I was born in the Cheruvillil family of Vadayambadi in Puthencruz to Mathai and Kunjamma on July 22, 1929.
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C.M. Thomas served as the vicar of St. Peter's church, Puthencruz from 1959 while also serving churches at Mookkannur, Vellathooval, Keezhumuri, St Peters & St Pauls Orthodox Church - Fort Cochin, Valamboor and later at Calcutta and Trichur.
During 1975-1979 he completed his Seminary Course from the Malecruz Dayro, Puthencruz, Kerala and Syriac studies under Joseph Sir, Paulose Mor Athanasius Metropolitan (Kadavil Thirumeni II),Yakob Mor Themothios Metropolitan (Thrikkothamangalam), R. V Markose, and Skariya Cor-Episcopa.