the Chera dynasty. The Thomas of Cana copper plates were extant in Kerala until the 17th century after which point they were lost. Classical period As the community grew and immigration by East Syriac Christians increased, the connection with the Church of the East, centred in the Persian capital of Seleucia-Ctesiphon, strengthened. From the early 4th century the Patriarch of the Church of the East provided India with clergy, holy texts, and ecclesiastical infrastructure, and around 650 Patriarch Ishoyahb III solidified the Church of the East's jurisdiction over the Saint Thomas Christian community. In the 8th century Patriarch Timothy I organised the community as the Ecclesiastical Province of India, one of the church's Provinces of the Exterior. After this point the Province of India was headed by a metropolitan bishop, dispatched from Persia, the "Metropolitan-Bishop of the Seat of Saint Thomas and the Whole Christian Church of India". His metropolitan see was probably in Cranganore, or (perhaps nominally) in Mylapore, where the shrine of Thomas was located. Under him were a varying number of bishops, as well as a native Archdeacon, who had authority over the clergy and who wielded a great amount of secular power. Some contact and transmission of knowledge of the Saint Thomas Christians managed to reach the Christian West, even after the rise of the Islamic empires. Byzantine traveller Cosmas Indicopleustes wrote of Syrian Christians he met in India and Sri Lanka in the 6th century. In 883 the English king Alfred the Great reportedly sent a mission and gifts to Saint Thomas' tomb in India. During the Crusades, distorted accounts of the Saint Thomas Christians and the Nestorian Church gave rise to the European legend of Prester John. The port at Kollam, then known as Quilon, was founded in 825 by Maruvān Sapir Iso, a Persian Christian merchant, with sanction from Ayyanadikal Thiruvadikal, the king of the independent Venad or the State of Quilon, a feudatory under Sthanu Ravi Varma Perumal of the Chera kingdom. Sapir Iso is usually identified either as the East Syriac Christian merchant who led the East Syriac bishops Mar Sabor and Mar Proth to the Christians of Malabar or as the first of those two bishops. This accompanied the second Assyrian migration into the Malabar coast other than the Knanaya migration. The two bishops were instrumental in founding many Christian churches with Syrian liturgy along the Malabar coast and were