Quarters and suburbs of Ctesiphon

Seleucia (; ), also known as or or Seleucia ad Tigrim, was a major Mesopotamian city, located on the west bank of the Tigris River within the present-day Baghdad Governorate in Iraq. It was founded around 305 BC by Seleucus I Nicator as the first capital of the Seleucid Empire, and remained an important center of trade and Hellenistic culture after the imperial capital relocated to Antioch. The city continued to flourish under Parthian rule beginning in 141 BC; ancient texts claim that it reached a population of 600,000. Seleucia was destroyed in 165 AD by Roman general Avidius Cassius and gra

right|thumb|Map of the southwestern Sasanian province of Asoristan and its surroundings Veh-Ardashir (also spelled as Beh-Ardashir and Weh-Ardashir), was an ancient Sasanian city in present-day Iraq, and formed a suburb of their capital, Ctesiphon.

right|thumb|300px|Map of the southwestern part of the Sasanian Empire. Valashabad (also spelled as Valakhshkert, Valakhshgerd and Valakhshkard), known in Greek sources as Vologesocerta, and in Arabic sources as Sabat (), was an ancient city in present-day Iraq, and formed a suburb of Ctesiphon, the capital of the Parthian Empire and their successors, the Sasanian Empire.