The First Triumvirate was made up of Gaius Julius Caesar, Gnaeus Pompeius Magnus and Marcus Licinius Crassus. Caesar used his connection to Crassus and his money to gain favor with important people throughout the city.
The First Triumvirate began to fall apart with the death of Crassus. The death of Caesar's daughter, Julia, who was also Pompey's wife, ended the alliance between the two men. This eventually led to an all-out war between them in 49 B.C.
Pompey left Rome during the war, taking shelter in Egypt, but he was betrayed by the king and beheaded. When Caesar arrived in Egypt, he was presented with Pompey's head. Caesar won the war, and this eventually lead to his appointment as dictator of the Roman Republic.