Gaius Julius Caesar . It was the full name ( tria nomina ) of the dictator Julius Caesar , as well as other prominent men of the Roman Republic , including the dictator 's father and grandfather . Gaius Julius Caesar ( ca. 130 BC -- 85 BC ) was a Roman senator , a supporter of his brother-in-law , Gaius Marius , and the father of Gaius Julius Caesar , the dictator . He was the brother of Sextus Julius Caesar ( consul in 91 BC ) and the son of Gaius Julius Caesar .
Gaius Julius Caesar was the father of Gaius Julius Caesar.