Proper noun
Seleucid Empire
(historical) A Greek-Macedonian empire created by Seleucus out of the eastern conquests of Alexander the Great and ruled by the Seleucid dynasty (312–63 BCE).
Division of the empire main Kingdoms of the Diadochi in 281 BC: the Ptolemaic Kingdom (dark blue), the Seleucid Empire (yellow), Kingdom of Pergamon (orange), and Kingdom of Macedon (green). Source: Internet
Seleucus established himself in Babylon in 312 BC, the year used as the foundation date of the Seleucid Empire. Source: Internet
Starting from 312, he expanded the Seleucid Empire eastward of Babylon, purportedly encompassing parts of Eastern Arabia. citation Archaeological evidence of Greek-influenced materials has been discovered in Qatar. Source: Internet
Macedonia and the Seleucid Empire agreed to an alliance to conquer and divide Egypt. Fearing this increasingly unstable situation, several small Greek kingdoms sent delegations to Rome to seek an alliance. Source: Internet