According to Eastern Christian tradition, Addai of Edessa or Thaddeus of Edessa was one of the seventy disciples of Jesus.
Icon of St. Thaddeus (10th century, Saint Catherine's Monastery, Mount Sinai)
Abgar receiving the Mandylion from Thaddeus (encaustic icon, Saint Catherine's Monastery, Mount Sinai).
The seventy disciples, known in the Eastern Christian traditions as the seventy apostles, were early emissaries of Jesus mentioned in the Gospel of Luke.
Icon of the Seventy Apostles
Erastus, Olympus, Rhodion, Sosipater, Quartus and Tertius
Stachys, Amplias, Urban
Patrobulus, Hermas, Linus, Caius, Philologus