premise: Gaius Julius Caesar was the father of a daughter.
hypothesis: 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 . They had two daughters , known as Julia Major and Julia Minor , and a son , Gaius , who was born in 100 BC . Julia ( c. 130 BC -- 69 BC ) was a daughter of Gaius Julius Caesar II ( praetor-grandfather of Caesar ) and Marcia ( daughter of praetor Quintus Marcius Rex ) .