Mar Thoma I, also known as Valiya Mar Thoma (Mar Thoma the Great) and Arkkadiyokkon Thoma (Archdeacon Thomas) in Malayalam and Thomas de Campo in Portuguese was the first native-born, popularly-selected Metropolitan bishop of the 17th-century Malankara Church. He was the last Archdeacon of the undivided St. Thomas Christians of Malankara (Maliyankara).