What was King Arthur' father's name?

According to most sources, King Arthur was born of King Uther Pendragon and Igraine, who was wife of the Duke of Cornwall before she married Pendragon. Uther, consumed with obsession/love/lust (whatever you believe), rallied his army and attacked Cornwall. In the course of the battle, Cornwall was killed, and Igraine and Pendragon married, bearing Arthur. However, threat of Saxon attack moved Pendragon to foster out his child. Arthur grew up never knowing of his royal birth. Until, of course, he first laid eyes on glimmering Excalibur.