Thomas-

 The Twelve Apostles

His name is Aramaic meaning twin. John uses the Greek rendering Didymus which means the same thing. Because of his name it is assumed that he had a twin brother or sister. For all of time at least, he is known as Doubting Thomas because of the incident in the upper room.

Ministry: Tradition says he preached to the Parthians, Medes, Persians, Carmanians, Hyrcanians, Bactrians, Magians, and finally in India where he died. the church Martoma which claimed Thomas as its founder. the church Martoma  tradition is very old.Christians in India in the 4th century.