Devasahayam Pillai UPSC: Devasahayam Pillai converted to Christianity in 1745 and took the names of Lazarus and Devasahayam. He went on to fight against Caste discrimination prevalent in the country and was persecuted and then killed.
source https://www.jagranjosh.com/current-affairs/who-is-devasahayam-pillai-first-indian-layman-to-be-declared-saint-by-the-vatican-1652680668-1