In Irish mythology, Usnach (also known as usnech) was the mother of Naoise and two other sons, all three of whom were killed by her brother, Conchobar mac Nessa. The mythology of pre-Christian Ireland did not entirely survive the conversion to Christianity, but much of it was preserved, shorn of its religious meanings, in medieval Irish literature, which represents the most extensive and best preserved of all the branches of Celtic mythology. ... In Irish mythology, Naoise (also spelled Noisiu) was the nephew of King Conchobar of Ulster, and a son of Usnech (or Uisliu), in the Ulster Cycle. ... In Irish mythology, Conchobar mac Nessa (also Conchobor, Conchubar, Conchobhar, Conchubhar, Conchúr, Conchúir, Conor) was king of Ulster during the events of the Ulster Cycle. ...