"The first definite proof of the existence of a Jewish colony near Cranganore is, in the meantime, the Tamil charter of Bhaskara Ravivarman (978-1036 A.D.), a grant of lands and privileges, written in the obsolete Vatteluttu script of ancient Tamil. Jewish, Muslim and Christian travel accounts of the twelfth and thirteenth centuries mention small Jewish settlements all along the Malabar coast, in towns such as Calicut, Quilon and Cranganore (Shingali), and at various places further north... The Jews of Malabar came to be divided in ‘White’ and ‘Black’ Jews and the latter were either the offspring of mixed marriages between Jews and Hindus or descendants of Hindus who had converted to Judaism.125 White Jews say that the Black Jews are descendants of the numerous slaves who were purchased and who converted to Judaism to be manumitted. The Black Jews themselves claim to be the descendants of the Israelites of the first captivity.126 However that may be, the main source of replenishment of the Malabar Jews still remained the Islamic Middle East."
January 1, 1970
https://en.wikiquote.org/wiki/History_of_the_Jews_in_India