Id), on the Euphrates; Jeziret ibn `Omar, Mosul (q.v.), Tekrit, on the Tigris; Edessa (q.v.), Harran (q.v.), on confluents of the Belikh; Veranshehr (Tela), Ras al-`Ain (Rhesaena), Mardin (half-way up the mountain wall), and Nasibin (Assyr.
In 242 Mesopotamia was entered by a great Roman army which recovered Carrhae and Nisibis, and defeated the Persians at Rhesaena; but when Gordian, after a difficult march down the Khabur, was murdered at Zaitha below Circesium, Philip the Arabian (244) made the best terms he could with Shapur I.
At the Nicene Council there were bishops from Nisibis (Jacob), Rhesaena, Macedonopolis (on the Euphrates, west of Edessa), and Persia (Harnack, Mission and Expansion of Christianity, ii.