The Battle of Ecbatana is fought in 129 BCE between the Seleucids led by Antiochus VII Sidetes and the Parthians led by Phraates II.

Phraates II (ca.

139/138 BCE - ca.

128 BCE) faces the final attempt on the part of the Seleucids to regain their power in the east.

The Seleucids suffersa crushing defeat at the Battle of Ecbatana and Antiochus VII himself perishes.

This battle marks the decisive and final defeat for the Seleucid kingdom by the Parthians.