Which wife of Julius Caesar did he divorce, as he wanted his wife to be above suspicion?

Caesar was married to Cornelia, a woman of patrician rank and the daughter of Lucius Cornelius Cinna. Cornelia died in 69 or 68 BC, as her husband was preparing to go to Spain.

Returning from Spain, Caesar married Pompeia, a granddaughter of Sulla, the famous Roman general and statesman. Their marriage ended in scandal. In 63 BC, Caesar was elected Pontifex Maximus. At that time, an ambitious young nobleman named Publius Claudius Pulcher either tried or did seduce Pompeia. This alleged situation shocked the Roman aristocracy, and rumors swirled about Pompeia's fidelity. Caesar felt that he had no choice but to divorce Pompeia, not because he personally believed the rumors, but because the wife of the Pontifex Maximus had to be above suspicion.

Calpurnia was either the third or fourth wife of Julius Caesar. She was his wife at the time of his assassination. According to contemporary historical sources, she was a good and faithful wife, in spite of her husband's infidelity. She had been forewarned about the attempt on his life, and she tried in vain to prevent his murder.

Calpurnia was born c. 76 BC in Rome. She was the daughter of Lucius Calpurnius Piso Caesoninus, consul (the highest elected political office of the Roman Republic from 509 to 27 BC). Calpurnia was married to Caesar late in 59 BC.

Cossutia was a woman who became engaged to Julius Caesar prior to his reaching adulthood. There has been debate among historians on whether the couple ever got married.