It is believed that Mar Sapor Iso also proposed that the Chera king create a new seaport near Kollam in lieu of his request that he rebuild the almost vanished inland seaport at Kollam (kore-ke-ni) near Backare (Thevalakara), also known as Nelcynda and Tyndis to the Romans and Greeks and as Thondi to the Tamils, which had been without trade for several centuries because the Cheras were overrun by the Pallavas in the 6th century, ending the spice trade from the Malabar coast. This allowed the Nestorians to stay in the Chera kingdom for several decades and introduce the Christian faith among the Nampoothiri Vaishnavites and Nair sub-castes in the St. Thomas tradition, with the Syrian liturgy as a basis for the Doctrine of the Trinity, without replacing the Sanskrit and Vedic prayers. The Tharisapalli plates presented to Maruvan Sapor Iso by Ayyanadikal Thiruvadikal granted the Christians the privilege of overseeing foreign trade in the city as well as control over its weights and measures in a move designed to increase Quilon's trade and wealth. The two Christians were also instrumental in founding Christian churches with Syrian liturgy along the Malabar coast, distinct from the ancient Vedic Advaitam propounded by Adi Shankara in the early 9th century among the Nampoothiri Vaishnavites and Nair Sub Castes, as Malayalam was not accepted as a liturgical language until the early 18th century.