Saint Thaddeus of Edessa

According to Eastern Christian tradition, Addai of Edessa (Syriac: ܡܪܝ ܐܕܝ, Mar Addai or Mor Aday sometimes Latinized Addeus) or Thaddeus of Edessa was one of the seventy disciples of Jesus. Based on various Eastern Christian traditions, Addai was a Jew born in Edessa (now Şanlıurfa, Turkey). He came to Jerusalem for a festival where he heard the preaching of John the Baptist (St. John the Forerunner). After being baptized in the Jordan River, he remained in Judea and became a follower of Jesus. He was chosen as one of the seventy disciples sent in pairs to preach in the cities and places. After Pentecost and the ascension of Jesus, Addai started preaching the gospel in Mesopotamia, Syria and Persia. He ordained priests in Edessa, converted many to Christianity and built up the church there. He also went to Beirut to preach, and many believe that he founded a church there. The Syriac liturgy referred to as the Liturgy of Addai and Mari originated around the year 200 AD and is used by the Assyrian Church of the East and the Chaldean Catholic Church (both of which are based in Iraq); it is also used by the Eastern Syriac Churches in India which trace their origins to Thomas the Apostle, namely, the Chaldean Syrian Church and Syro-Malabar Catholic Church . His feast is celebrated on August 5 in the Christian calendar. Among the Eastern Orthodox faithful, Addai was a disciple of Christ sent by St. Thomas the Apostle to Edessa in order to heal King Abgar V of Osroene, who had fallen ill. He stayed to evangelize, and so converted Abgar—or Agbar, or in one Latin version "Acbar" — and his people including Saint Aggai and Saint Mari. The story of how King Abgarus V and Jesus had corresponded was first recounted in the 4th century by the church historian Eusebius of Caesarea.