self explanatory, very unknown Christian group who claim to be converts from Saint Thomas in the very early years of Christianity. They are Nestorians who were in communion with the church until the Muslim conquests where they were for the most part left to their devices. One idea I had is from wikipedia, a certain King Ayyanadikal Kurakoni of Venad granted them exclusive rights in 849. Maybe he converts, and attempts to flip his Kingdom. Or maybe a later date with the Portuguese encouraging the ST Christians in communion with the Catholic church to take over the area.
https://en.wikipedia.org/wiki/Saint_Thomas_Christians
Surprise me
https://en.wikipedia.org/wiki/Saint_Thomas_Christians
Surprise me