Marcus Porcius Cato
Gaius Cato belonged to the plebeian gens Porcia, which became prominent at the beginning of the second century thanks to Cato the Censor, the grandfather of Gaius. Born before 157, his parents were Marcus Porcius Cato Licinianus and Aemilia Tertia, the youngest daughter of Aemilius Paullus. As a result, Gaius was the nephew of Scipio Aemilianus, the eldest son of Aemilius Paullus and natural brother of his mother. In addition, Gaius was the younger brother of Marcus Porcius Cato, consul in 118, who died during his office.