Nasibina, Nisibis), on confluents of the Khabur; Sinjar (Singara) on the Tharthar.
Nisibis thrice endured unsuccessful siege (33 8, 346, 35 o), although meanwhile Constantine had suffered defeat at Singara (348).
Then Mesopotamia enjoyed two short rests (separated by a sharp struggle) while the rivals were engaged elsewhere, when in 363 Julian made his disastrous attempt, and Jovian bought peace at the price, among other things, of Singara and Nisibis - i.e.
He then concluded a peace, by the terms of which Armenia remained under Roman suzerainty, and the steppes of northern Mesopotamia, with Singara and the hill-country on the left bank of the Tigris as far as Gordyene, were ceded to the victor (Amnaian.
The conflict centred round the Mesopotamian fortresses; Shpur thrice besieged Nisibis without success, but reduced several others, as Amida (359) and Singara (360), and transplanted great masses of inhabitants into Susiana.