Lucius Cornelius Cinna
Caesar married Pompeia in 67 BC, after he had served as quaestor in Hispania, his first wife Cornelia having died in 69 BC. Caesar was the nephew of Gaius Marius, and Cornelia was the daughter of Lucius Cornelius Cinna so that they were related to both the leaders of the losing "populares" side in the civil war of the 80s BC.