Thaddeus of Edessa festival, and heard the preachings of John the Baptist (St. John the Forerunner). After being baptized by John the Baptist in the Jordan River, he remained in Palestine. He later met and became a follower of Jesus. He was chosen to be one of the seventy disciples, whom Jesus sent in pairs to preach in the cities and places. After Pentecost and the ascension of Jesus, Thaddeus started preaching the gospel in Mesopotamia, Syria and Persia. Thaddaeus ordained priests in Edessa, converted many to Christianity and built up the church there. He also went to Beirut to preach and founded
John the Baptist as a priest of the course of Abijah and Elizabeth as one of the daughters of Aaron, this would make John a descendant of Aaron on both his father's and mother's side. On the basis of this account, the Catholic as well as the Anglican and Lutheran liturgical calendars placed the feast of the Nativity of John the Baptist on June 24, six months before Christmas. Elizabeth is described as a "relative" of Mary, the mother of Jesus in . There is no mention of a family relationship between John and Jesus in the other Gospels, and Raymond E. Brown