Promellian-Menthar War

The Promellian-Menthar War was a long war between the Promellian and Menthar species that ended with a battle at Orelious IX during the 14th century. The conflict resulted in the extinction of both species.

In 2366, the USS Enterprise-D went to Orelious IX to study the ruins of the battle. (TNG: "Booby Trap")