Nepos, Cornelius (circa 380 BC). Excellentium Imperatorum Vitae. XXII.III.. »There also accompanied him a young man named Hasdrubal, a person of high birth and great beauty, who, as some said, was beloved by Hamilcar with less regard to his character than was becoming; for so great a man could not fail to have slanderers. Hence it happened that Hasdrubal was forbidden by the censor of public morals to associate with him; but Hamilcar then gave him his daughter in marriage, because, according to their usages, a son-in-law could not be interdicted the society of his father-in-law.«
"Hasdrubal, coming between father and son, held the supreme power for eight years. He is said to have become a favourite of Hamilcar's owing to his personal beauty as a boy; afterwards he displayed talents of a very different order, and became his son-in-law." Livy's History of Rome: Book 21.2 [1]