Cumhall is a character from Irish mythology, specifically associated with the Ulster Cycle. He is known as the father of the legendary hero Cú Chulainn. Cumhall was a leader of the Fianna, a band of warriors in ancient Ireland, and is often depicted as a brave and noble figure. In the tales, Cumhall's life is marked by conflict and tragedy, particularly his rivalry with Fergus mac Róich. His death leads to significant events in the stories of Cú Chulainn, as it sets the stage for the young hero's rise and the challenges he faces in his quest for honor and glory.