Thomas the Apostle in the context of "Malankara Mar Thoma Syrian Church"

The Gospel of John is the fourth of the New Testament's four canonical Gospels. It contains a schematic account of the ministry of Jesus, with seven "signs" culminating in the raising of Lazarus (foreshadowing the resurrection of Jesus) and seven "I am" discourses culminating in Thomas's proclamation of the risen Jesus as "my Lord and my God". The penultimate chapter's concluding verse set out its purpose, "that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in his name."

John was written between AD 90–100. The gospel is anonymous, although it identifies a "disciple whom Jesus loved" as the source of its traditions and perhaps author. Twentieth-century scholarship interpreted the gospel within the paradigm of a "Johannine community", but this has been increasingly challenged in the 21st century, and there is currently considerable debate over the gospel's historical context. As it is closely related in style and content to the Johannine epistles, most scholars treat the four books, along with the Book of Revelation, as a single corpus of Johannine literature, albeit not by the same author.

Prester John (Latin: Presbyter Ioannes) was a mythical Christian patriarch, presbyter, and king. Stories popular in Europe in the 12th to the 17th centuries told of a Nestorian patriarch and king who was said to rule over a Christian nation lost amid the pagans and Muslims in the Orient. The accounts were often embellished with various tropes of medieval popular fantasy, depicting Prester John as a descendant of the Three Magi, ruling a kingdom full of riches, marvels, and strange creatures.

At first, Prester John was imagined to reside in India. Tales of the Nestorian Christians' evangelistic success there and of Thomas the Apostle's subcontinental travels as documented in works like the Acts of Thomas probably provided the first seeds of the legend. As Europeans became aware of the Mongols and their empire, accounts placed the king in Central Asia, and eventually Portuguese explorers came to believe that the term was a reference to Ethiopia, which at that time was an isolated Christian "exclave" distant from any other Christian-ruled territory.

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San Thome Church, officially known as the National Shrine of St. Thomas Cathedral Basilica, is a church of the Catholic Church in India, at the Santhome neighbourhood of Chennai, in Tamil Nadu. It is the cathedral of the Archdiocese of Madras-Mylapore, and a minor basilica dedicated to Saint Thomas the Apostle. The present structure dates back to 1523 AD, when it was built by the Portuguese over the tomb of Thomas. In 1896, it was renovated in the Madras province according to neo-Gothic designs, as was favoured by British architects in the late 19th century. On April 1, 1896, it was solemnly consecrated by Bishop Reed da Silva of Madras, assisted by the Bishop of Dhaka, Peter Joseph Hurth.

The East Syriac Rite, or East Syrian Rite (also called the Edessan Rite, Assyrian Rite, Persian Rite, Chaldean Rite, Nestorian Rite, Babylonian Rite or Syro-Oriental Rite), is an Eastern Christian liturgical rite that employs the Divine Liturgy of Saints Addai and Mari and utilizes the East Syriac dialect as its liturgical language. It is one of the two main liturgical rites of Syriac Christianity, along with the West Syriac Rite (Syro-Antiochene Rite).

The East Syriac Rite originated in Edessa, Mesopotamia, and was historically used in the Church of the East—the largest branch of Christianity operating primarily east of the Roman Empire—, with pockets of adherents as far as South India, Central and Inner Asia, and a strong presence in the Sasanian (Persian) Empire. The Church of the East traces its origins to the 1st century, when Saint Thomas the Apostle and his disciples Saint Addai and Saint Mari brought the faith to ancient Mesopotamia (today's modern Iraq, eastern Syria, southeastern Turkey, and regions along the Turkish–Syrian and Iran–Iraq borders). According to traditional accounts, Thomas the Apostle is believed to have traveled as far as the Malabar coast of southwestern India. This account is not yet confirmed, as the earliest-record for an organised Christian presence in India is from the 6th century account of Alexandrian traveller Cosmas Indicopleustes.

The Saint Thomas Christians, also called Syrian Christians of India, Marthoma Suriyani Nasrani, Malankara Nasrani, or Nasrani Mappila, are an ethno-religious community of Indian Christians in the state of Kerala (Malabar region), who, for the most part, employ the Eastern and Western liturgical rites of Syriac Christianity. They trace their origins to the evangelistic activity of Thomas the Apostle in the 1st century. The Saint Thomas Christians had been historically a part of the hierarchy of the Church of the East but are now divided into several different Eastern Catholic, Oriental Orthodox, Protestant, and independent bodies, each with their own liturgies and traditions. They are based in Kerala and they speak Malayalam. Nasrani or Nazarene is a Syriac term for Christians, who were among the first converts to Christianity in the Near East.

Historically, this community was organised as the Province of India of the Church of the East, by Patriarch Timothy I (780–823 AD) in the eighth century, it was served by bishops and a local dynastic archdeacon. In the 14th century, the Church of the East declined in the Near East, due to persecution from Tamerlane. Portuguese colonial overtures to bring St Thomas Christians into the Latin Church of the Catholic Church, administered by their Padroado system in the 16th century, led to the first of several rifts (schisms) in the community. 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 Puthankoor or Puthankūttukār ("New allegiance" ) and Paḻayakūṟ or Pazhayakūr ("Old allegiance") factions. The Paḻayakūṟ comprise the present day Syro-Malabar Church and Chaldean Syrian Church which continue to employ the original East Syriac Rite. The Puthankoottukar, 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.