King David, who conquered the Philistine giant Goliath, ruled for 40 years until his death at 70. He developed unmistakable features of autonomic dysfunction - notably, severe hypothermia without compensatory temperature regulation, which is recounted in the Bible as his servants’ attempts to keep him warm through his last marriage to Abishag, a woman sought out for her “unusually warm skin” who “took care of the king and waited on him, but he had no intercourse with her” (1 Kings, The Old Testament). King David’s unconsummated marriage to a striking young woman suggests parasympathetic dysfunction. Furthermore, he potentially suffered from postural instability, as oil canvas renderings from the Renaissance era depict him in a supine position, propped up against pillows. In his old age, he seldom made diplomatic visits, as he was possibly bedridden from postural instability.