Final answer:
The First Triumvirate consisted of Julius Caesar, Pompey, and Crassus; they formed an alliance in 60 BCE to advance their political and military ambitions, despite their mutual distrust.
Step-by-step explanation:
The First Triumvirate was composed of Julius Caesar, Pompey, and Crassus. This political alliance was established in 60 BCE after the optimates in the Senate attempted to block their influence in Roman politics. With their combined wealth, political power, and military expertise, they were able to secure the positions and commands they desired: Caesar in Gaul, Pompey in the Eastern Mediterranean, and Crassus in Parthia. Their alliance, however, was marked by mutual distrust and rivalry, eventually leading to its dissolution following the death of Crassus and resulting in conflict between Caesar and Pompey.