Who was King Arthur's father?

King Arthur's father was Uther Pendragon, a legendary king of Britain in Arthurian legend. Uther, often depicted as a powerful and ambitious ruler, used Merlin's magic to conceive Arthur with Igraine, the wife of Duke Gorlois. This mystical conception is a key element in Arthur's origin story and his eventual rise to the throne. Uther's reign and his relationship with Arthur set the stage for many of the tales surrounding the Knights of the Round Table.