Caius was the son of Caius I Julius but his mother is unknown. The date and place of his birth have not been found.
His wife was Marcia. They were married, but the date and place have not been found. Their three known children were Caius III (c0140BC-0085BC), Sextus III Julius Cæsar (?-0090/89BC) and Julia Cæsaris (c0130BC-0069BC).
Note 1
He may be the Caesar who died suddenly one morning in Pisae, Italy, while putting on his shoes; other sources attribute his death to a growth in the throat