Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[240] But when she was once dead, the king's affections for her were kindled in a more outrageous manner than before, whose old passion for her we have already described; for his love to her was not of a calm nature, nor such as we usually meet with among other husbands; for at its commencement it was of an enthusiastic kind, nor was it by their long cohabitation and free conversation together brought under his power to manage; but at this time his love to Mariamne seemed to seize him in such a peculiar manner, as looked like Divine vengeance upon him for the taking away her life; for he would frequently call for her, and frequently lament for her in a most indecent manner. Moreover, he bethought him of every thing he could make use of to divert his mind from thinking of her, and contrived feasts and assemblies for that purpose, but nothing would suffice; he therefore laid aside the administration of public affairs, and was so far conquered by his passion, that he would order his servants to call for Mariamne, as if she were still alive, and could still hear them. And when he was in this way, there arose a pestilential disease, and carried off the greatest part of the multitude, and of his best and most esteemed friends, and made all men suspect that this was brought upon them by the anger of God, for the injustice that had been done to Mariamne. This circumstance affected the king still more, till at length he forced himself to go into desert places, and there, under pretense of going a hunting, bitterly afflicted himself; yet had he not borne his grief there many days before he fell into a most dangerous distemper himself: he had an inflammation upon him, and a pain in the hinder part of his head, joined with madness; and for the remedies that were used, they did him no good at all, but proved contrary to his case, and so at length brought him to despair. All the physicians also that were about him, partly because the medicines they brought for his recovery could not at all conquer the disease, and partly because his diet could be no other than what his disease inclined him to, desired him to eat whatever he had a mind to, and so left the small hopes they had of his recovery in the power of that diet, and committed him to fortune. And thus did his distemper go on, while he was at Samaria, now called Sebaste.