In 429 BC, during the Plague of Athens, Pericles witnessed the death of his sister and of both his legitimate sons, Paralus and Xanthippus, from his first wife. With his morale undermined, he burst into tears, and not even Aspasia's companionship could console him. Just before his death, the Athenians allowed a change in the citizenship law of 451 BC that made his half-Athenian son with Aspasia, Pericles the Younger, a citizen and legitimate heir, a decision all the more striking in considering that Pericles himself had proposed the law confining citizenship to those of Athenian parentage on both sides. Pericles died of the plague in the autumn of 429 BC.