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The Synod of Diamper (Udayamperoor Synod) (Malayalam: ഉദയംപേരൂർ സൂനഹദോസ്, romanized: Udayampērūṟ Sūnahadōs), held at Udayamperoor (known as Diamper in non-vernacular sources) in June 1599, was a diocesan synod, or council, that created rules and regulations for the ancient Saint Thomas Christians (also known as Mar Thoma Nasranis) of the Malabar Coast, a part of modern-day Kerala state, India, formally subjugating them and downgrading their whole Metropolitanate of India as the Diocese of Angamale, a suffragan see to the Archdiocese of Goa administered by Latin Church Padroado missionaries.[1][2] This synod also introduced forced Liturgical Latinisation and the eschewal of local practices and beliefs, leading to a significant ecclesial protest by Saint Thomas Christians known as Coonan Cross Oath and a subsequent schism in the mid-17th century.[3]
- ^ Melton, J. Gordon (2014). Faiths Across Time: 5,000 Years of Religious History [4 Volumes]: 5,000 Years of Religious History. Abc-Clio. p. 1152. ISBN 9781610690263.
- ^ Nedungatt, George, ed. (2001). The Synod of Diamper Revisited. Pontificio Istituto Orientale. p. 155. ISBN 9788872103319.
- ^ "Synod of Diamper". britannica.com. Encyclopedia Britannica. Retrieved 10 January 2021.
The forced Latinization and disregard for local tradition were accompanied by violence and led to schism among Thomas Christians by the mid-17th century.