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Tertius of Iconium (also Tertios) acted as an amanuensis for the Apostle Paul, writing down his letter to the Romans. According to church tradition he is numbered among the Seventy Disciples, and was Bishop in Iconium after the Apostle Sosipater. He died a martyr. The Catholic Church marks St. Tertius days on October 30 and November 10.
Troparion (Tone 3) 
- Holy Apostles, Erastus, Olympas, Herodian, Sosipater, Quartus and Tertius,
- entreat the merciful God,
- to grant our souls forgiveness of transgressions.
Kontakion (Tone 2)
- Illumined by divine light, O holy apostles,
- you wisely destroyed the works of idolatry.
- When you caught all the pagans you brought them to the Master
- and taught them to glorify the Trinity.
External links 
- Apostle Tertius of the Seventy, October 30 (OCA)
- Apostle Tertius of the Seventy, November 10 (OCA)
- Erastos, Olympas, Herodion, Sosipatros, Quartus, Tertios, Apostles of the 70 (GOARCH)
- The Holy Apostles Cleopas, Tertius, Mark, Justus and Artemas (Prologue of Ohrid, October 30)
- The Holy Apostles Olympas, Erastus, Quartus, Herodion, Sosipater and Tertius (Prologue of Ohrid, November 10)