"C.B. Firth could have included the testimony of Origen’s teacher, the Greek missionary theologian Clement of Alexandria (ca. 150-235), who had travelled from Greece to Italy, Syria and Palestine before settling in Egypt. Clement is known as an apologist rather than a father of the Church, as he tried to reconcile Platonic philosophy with Christian doctrine. He is the first orthodox Christian scholar to say that St. Thomas went to Parthia."