He tricked his way into to Tintagel Castle while posing as the Duke of Cornwall, Gorlois, in order to make love to Igraine and conceive a famous son.
This man reportedly died from drinking from a poisonous spring at Verulamium. Despite his infirmity, reflected in his being referred to as "Half-Dead", this man triumphed in battle against Octa, the son of one of the perpetrators of the Night of the Long Knives, Hengist. His brothers include Constans and Aurelius Ambrosius, and this man's rise to power was foreshadowed by a comet shaped like a particular animal. He tricked his way into to Tintagel Castle while posing as the Duke of Cornwall, Gorlois, in order to make love to Igraine and conceive a famous son. For 10 points, name this man whose success was predicted by Merlin, the father of the future King Arthur.
This man reportedly died from drinking from a poisonous spring at Verulamium.
{Uther Pendragon} [accept {Wthyr} or {Uter} for the {forename} and {Bendragon} or {Pendraeg} for the {surname}]