Aesperus

According to postings by "Swordmage" author Richard Baker on the Candlekeep forum: Aesperus, aka The King in Copper, was a human necromancer and former ruler of the short-lived kigdom of Thentur ca. 1050 DR. Aesperus was deposed in a rebellion led by Lathander's clery. Upon his death, Aesperus transformed into a lich and now holds dominion over the undead in eastern Thar. Aesperus is a distant ancestor of the Hulmaster clan of Hulburg and has a pact with Hulmasters under which he promises to prevent the undead from rising within Hulburg. Aesperus is known as the King in Copper because of the enchanted copper bands he wears on his body.