Avtar Gill (born 17 July 1952 from Hamilton) is a retired Canadian professional darts player who currently members from the 1980s & 1990s.

The Synod of Diamper (Malayalam: ഉദയംപേരൂർ സൂനഹദോസ് Udayampērūr Sūnahadōs), held at Udayamperoor (known as Diamper in non-vernacular sources) in 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 their whole Archdiocese of Angamaly to the Archdiocese of Goa administered by Roman Catholic Padroado missionaries. This led to the permanent schism among the Thomas' Christians of India after 53 years, leading to the formation of Puthenkoor (New allegiance) and Pazhayakoor (Old allegiance) factions. The Pazhayakoor comprises the present day Syro-Malabar Church and Chaldean Syrian Church which continues to employ the East Syriac Rite (Babylonian Rite /Persian Rite) liturgy. Through the Coonan Cross Oath (1653), the Puthenkoor faction that resisted the Padroado dominance entered into communion with the Syriac Orthodox Church of Antioch to form the Malankara Syrian Church (West Syriac Rite liturgy). The descendant churches of the Malankara Syrian Church include the Malankara Syriac Orthodox Church (Jacobite Syrian Orthodox Church), the Malankara Orthodox Syrian Church (Indian Orthodox Church), the Malankara Marthoma Syrian Church, the Malankara Syrian Catholic Church (Eastern Catholic), and the Malabar Independent Syrian Church; all employing the West Syriac Rite (Antiochene Rite) liturgy. The Saint Thomas Christians were in communion with the Church of the East of Persia and the Patriarch of the Seleucia-Ctesiphon, and relied on their bishops. However, the Church of the East collapsed by 1552, through the schism of 1552, and a faction joined in communion with the Catholic Church (the modern day Chaldean Catholic Church). Mar Abraham of Angamaly was one of the last bishops from the Catholic Patriarchate of Babylon to the Saint Thomas Christians. Mar Abraham was given approval by Pope Pius IV in 1565. He died by 1597 and his successor was Archdeacon George of the Cross. The Synod of Diamper was convened on June 20, 1599, under the leadership of Aleixo de Menezes, Latin rite Archbishop of Goa. Archdeacon George of the Cross was forced to comply with the wishes of the Archbishop of Goa. This compliance separated the Saint Thomas Christians from the Chaldean Catholic jurisdiction in Persia and subjected them directly to the Latin Archbishopric of Goa. The Archbishopric of Angamaly was downgraded to a bishopric under Goa in 1600. Portuguese Padroado rule was thus imposed and the bishops for Saint Thomas Christians were appointed by Portuguese Padroado. About 50 years later, dissidents held the Coonan Cross Oath in 1653, to liberate themselves from the efforts for latinization by the Portuguese Padroado missionaries. The dissidents that left the Latin Church's jurisdiction became the Malankara Church, of which a faction joined in full communion with the Syriac Orthodox Church of Antioch (Oriental Orthodox Church) and started to employ the West Syriac Rite liturgy. The Mar Thoma Syrian Church and Malabar Independent Syrian Church are independent churches that split off from the Malankara Syrian Church during the 18th and 19th centuries, while they continue to employ the West Syriac Rite. From the Synod of Diamper in 1599 to the 19th century, the Syro-Malabarians were under the jurisdiction of the Latin Church and foreign bishops from Europe. In 1887, Pope Leo XIII fully separated the Syro-Malabarians from the Latin Church's jurisdiction, by establishing two Apostolic Vicariates, Thrissur and Kottayam (later Changanassery) under the guidance of indigenous Indian Syro-Malabar bishops, and named the Church as "The Syro-Malabar Church" to distinguish them from the Latin Catholics. The Syro-Malabar Church in effect became an autonomous sui iuris Eastern church within the Catholic communion. The Malankara Syrian Catholic Church is the faction from the Malankara Church that joined in full communion with the Holy See of Rome in 1930, and continue to employ the West Syriac Rite. After the schism of 1552, the Church of the East declined, and throughout the following centuries, the Church of the East was affected by several internal schisms. The non-Catholic branches of the Church of the East managed to survive a tumultuous period and eventually consolidate during the 19th century in the form of the Assyrian Church of the East and the Ancient Church of the East. While the pro-Catholic faction consolidated into the Chaldean Catholic Church. A minority faction within the Syro-Malabar Church split off and joined in communion with the Assyrian Church of the East during the 1870s, to form the Chaldean Syrian Church which employs the traditional East Syriac Rite of the historic Church of the East.
The Synod of Diamper (Malayalam: ഉദയംപേരൂർ സൂനഹദോസ് Udayampērūr Sūnahadōs), held at Udayamperoor (known as Diamper in non-vernacular sources) in 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 their whole Archdiocese of Angamaly to the Archdiocese of Goa administered by Roman Catholic Padroado missionaries. This led to the permanent schism among the Thomas' Christians of India after 53 years, leading to the formation of Puthenkoor (New allegiance) and Pazhayakoor (Old allegiance) factions. The Pazhayakoor comprises the present day Syro-Malabar Church and Chaldean Syrian Church which continues to e