Historically, this community was organised as the Province of India of the Church of the East by PatriarchTimothy I (780–823 AD) in the eighth century, served by bishops and a local dynastic archdeacon.[9][12][13] In the 14th century, the Church of the East declined in the Near East, due to persecution from Tamerlane.[14][15][16][17][18]Portuguese colonial overtures to bring St Thomas Christians into the Latin Catholic Church, administered by their Padroado system in the 16th century, led to the first of several rifts (schisms) in the community.[19][20][21] The attempts of the Portuguese culminated in the Synod of Diamper, formally subjugating them to the Portuguese Padroado and imposing upon them the Roman Rite of worship. The Portuguese oppression provoked a violent resistance among the Thomasine Christians, that took expression in the Coonan Cross Oath protest in 1653. This led to the permanent schism among the Thomas' Christians of India, leading to the formation of Puthenkur or Puthenkūttukār ("New allegiance" ) and Paḻayakūṟ or Pazhayakūr ("Old allegiance") factions.[22] The Paḻayakūṟ comprise the present day Syro-Malabar Church and Chaldean Syrian Church which continue to employ the original East Syriac Rite liturgy.[9][23][24][25] The Puthenkur group, who continued to resist the Catholic missionaries, organized themselves as the independent Malankara Church and entered into a new communion with the Syriac Orthodox Church of Antioch, inheriting from them the West Syriac Rite, replacing the old East Syriac Rite liturgy.[26][9][27]
The Chaldean Syrian Church based in Thrissur represents the continuation of the traditional pre-sixteenth century church of Saint Thomas Christians in India.[28][29] It forms the Indian archdiocese of the Iraq-based Assyrian Church of the East, which is one of the descendant churches of the Church of the East. They were a minority faction within the Paḻayakūṟ faction, which joined with the Church of the East Bishop during the 1870s.[30]
^"The Stcei". Indianchristianity.com. Retrieved 24 September 2017.
^Ross, Israel J. (1979). "Ritual and Music in South India: Syrian Christian Liturgical Music in Kerala". Asian Music. 11 (1): 80–98. doi:10.2307/833968. JSTOR833968.
^Bundy, David D. (2011). "Timotheos I". In Sebastian P. Brock; Aaron M. Butts; George A. Kiraz; Lucas Van Rompay (eds.). Gorgias Encyclopedic Dictionary of the Syriac Heritage: Electronic Edition. Gorgias Press. Retrieved 22 September 2016.
^Encyclopedia Britannica (2011). Synod of Diamper. Encyclopedia Britannica Online. Encyclopedia Britannica Inc. Retrieved 23 December 2011.
^For the Acts and Decrees of the Synod cf. Michael Geddes, "A Short History of the Church of Malabar Together with the Synod of Diamper &c." London, 1694; Repr. in George Menachery (ed.), Indian Church History Classics, Vol.1, Ollur 1998, pp. 33–112.
^F. L. Cross; E. A. Livingstone, eds. (2009) [2005]. "Addai and Mari, Liturgy of". The Oxford Dictionary of the Christian Church (3rd rev. ed.). Oxford University Press. ISBN9780192802903.
^George, V. C. The Church in India Before and After the Synod of Diamper. Prakasam Publications. He wished to propagate Nestorianism within the community. Misunderstanding arose between him and the Assyrian Patriarch, and from the year 1962 onwards the Chaldean Syrian Church in Malabar has had two sections within it, one known as the Patriarch party and the other as the Bishop's party.
^South Asia. Missions Advanced Research and Communication Center. 1980. p. 114. ISBN978-0-912552-33-0. The Mar Thoma Syrian Church, which represents the Protestant Reform movement, broke away from the Syrian Orthodox Church in the 19th century.
^"Mission & Vision". St. Thomas Evangelical Church of India (steci) is an episcopal Church. Archived from the original on 18 January 2021. Retrieved 27 April 2020.