Parthian Empire
The Parthian Empire, ruled by the Parthians, a group of northwestern Iranian people, was the realm of the Arsacid dynasty, who reunited and governed the Iranian plateau after the Parni conquest of Parthia and defeating the Seleucid Empire in the later third century BC, and intermittently controlled Mesopotamia between ca 150 BC and 224 AD. The Parthian Empire quickly included Eastern Arabia.