Crassus Slain at the Battle of Carrhae
On June 9, 53 BC, Roman forces under Marcus Licinius Crassus were decisively defeated by the Parthian Empire near Carrhae in Mesopotamia. According to ancient sources, Crassus was killed during failed negotiations after his army was routed by Parthian cavalry and horse archers. His death ended the First Triumvirate between Crassus, Pompey, and Julius Caesar, destabilizing Roman politics. The disaster at Carrhae also marked a clear eastern limit to Roman expansion for generations.