Caesar was the go-between for Crassus and Pompey. They had been at odds for years, but Caesar tried to reconcile them. Between the three of them, they had enough money and political influence to control public business. This informal alliance, known as the First Triumvirate (rule of three men), was cemented by the marriage of Pompey to Caesar's daughter Julia. Caesar also married again, this time to Calpurnia, who was the daughter of another powerful senator.