Servilia (b.c. 104 BC, d. after 42 BC) was the mistress of Julius Caesar, mother of one of Caesar's assassins, Brutus, mother-in-law of another assassin, Cassius, and half-sister of Cato the Younger.
Little is known of Servilia's early life. She was a patrician who could trace her line back to Gaius Servilius Ahala, and was the eldest child of Livia Drusa and Quintus Servilius Caepio the Younger. Her parents had two other children, a younger Servilia and a younger Quintus Servilius Caepio. They divorced when she was young and her mother married Marcus Porcius Cato (who was father to Servilia's younger half-brother Cato the Younger.) Following her parents' divorce both her mother and stepfather died. Servilia and her younger siblings were brought up in the house of their maternal uncle, Marcus Livius Drusus, who was the tribune. He too, however, died when she was 16.
Prior to 85 BC, she was married to Marcus Junius Brutus the Elder, who became tribune of the plebs in 83 BC, and was founder of the colony in Capua. They had only one known child, Marcus Junius Brutus, born around 85 BC. Following the death of Sulla, who had been dictator in 79 BC but had resigned a year later, the elder Brutus was killed by Pompey after the surrender of Mutina, where he had fought him in 77 BC. Servilia's second marriage was with Decimus Junius Silanus, with whom she had three daughters; Junia Prima, Junia Secunda, and Junia Tertia.