The Battle of Ecbatana was fought in 129 BC between the Seleucids led by Antiochus VII Sidetes and the Parthians led by Phraates II, and marked the final attempt on the part of the Seleucids to regain their power in the east against the Parthians. After their defeat, the territory of the Seleucids was limited to the area of Syria.
Drachm of Antiochos VII
Coin of Phraates II
The Seleucid Empire was a Greek power in West Asia during the Hellenistic period. It was founded in 312 BC by the Macedonian general Seleucus I Nicator, following the division of the Macedonian Empire founded by Alexander the Great, and ruled by the Seleucid dynasty until its annexation by the Roman Republic under Pompey in 63 BC.
Seleucid Empire
"Chandra Gupta Maurya entertains his bride from Babylon": a conjectural interpretation of the "marriage agreement" between the Seleucids and Chandragupta Maurya, related by Appian
Coin of Seleucus I Nicator
In Bactria, the satrap Diodotus asserted independence to form the Greco-Bactrian kingdom c. 245 BC.