There was a leader, Vercingetorix, who was uniting the tribes of Gaul to defeat Gaio Giulio Cesare toward the end of the Gaulic Wars. Vercingetorix gave himself up to save the lives of his men, was held prisoner for five years and then executed by strangulation. Caesar's respect for this worthy foe is reflected in Vercingetorix being humanely strangled in private and not as part of a grotesque public display.
A depiction of Marcus Crassus appeared way back in Xena's first season, in the form of stock footage of Laurence Olivier from Spartacus (1960), edited into Athens City Academy of the Performing Bards (1996).
The real life Crassus died in battle while on campaign in Turkey near the Syrian border.