Patriarchal Province of Seleucia-Ctesiphon

The Patriarchal Province of Seleucia-Ctesiphon was an ecclesiastical province of the patriarch of the Church of the East. Its metropolitan see was in Seleucia-Ctesiphon, near Al-Mada’in in modern Iraq.

Source: Wikipedia — Patriarchal Province of Seleucia-Ctesiphon (CC BY-SA 4.0)