Arbayistan

Arbāyistān
Province of the Sasanian Empire
262–299 363–638
Map showing the Roman-Sasanian borders
Capital	Nisibis
Historical era	Late Antiquity
• Established	262
• Peace of Acilisene	363
• Annexed by the Rashidun Caliphate	638
Preceded by Succeeded by Mesopotamia (Roman province) Diyar Rabi'a
Today part of	Iraq Syria Turkey

Arbāyistān (Parthian: 𐭀𐭓𐭁𐭉𐭎𐭈𐭍 [ʾrb]ystn; Middle Persian: Arwāstān; Armenian: Arvastan)^[1] or Beth Arabaye (Syriac: Bēṯ ʿArbāyē) was a Sasanian province in Late Antiquity. Due to its situation and its road systems, the province was a source of income from commercial traffic, as well as a constant area of contention during the Roman–Persian Wars.^[2]

The province reached across Upper Mesopotamia toward the Khabur and north to the lower districts of Armenia; it bordered Adiabene in the east, Armenia in the north and Asoristan in the south. On the west, it bordered the Roman provinces of Osroene and Mesopotamia.^[3] The principal city of the Arbayistan province was Nisibis and it also included the fortress of Sisauranon.^[3]