In the earliest version of Compert C(h)on Culainn (The Conception of Cú Chulainn), his mother Deichtine is the daughter and charioteer of Conchobar mac Nessa, king of Ulster, and accompanies him as he and the nobles of Ulster hunt a flock of magical birds. The Death of Cu Chulainn. Possessing unparalleled sexual stamina, gluttony, generosity, lack of envy, and fearlessness, Fergus was the model of a brave and magnificent warrior.

Cu Chulainn is an Irish mythical hero who appears in the stories of the Ulster Cycle, as well as in Scottish and Manx folklore. When Cú chulainn’s foes came for the last time against him, his land was filled with smoke and flame, the weapons fell from their racks, and the day of his death drew nigh. The Legend of Cú Chulainn.

He is believed to be an incarnation of the god Lugh, who is also his father.

Excalibur was given to him by the Lady of the Lake alongside a magic scabbard. The Son of Lugh ran out of patience and lunged at the giant, who expertly parried with his spear. Conall Cernach had sworn that if Cú Chulainn died before him he would avenge him before sunset, and when he hears Cú Chulainn is dead he pursues Lugaid. Cú Chulainn ([kuːˈxʊlɪnʲ] ( listen), Irish for "Culann's Hound"), also spelled Cúchulainn, Cúchulain, Cú Ċulainn, Cúchullain or Cú Chulaind, is an Irish mythological hero who appears in the stories of the Ulster Cycle, as well as in Scottish and Manx[citation needed] folklore. The Death of Cú chulainn (pronounced Ku Hoolain). Superhuman strength forced the spearhead into Cú Chulainn's flesh, and the hero dropped his sword … Sometimes he is named Wayland ( Saxon myth); and Gofannon ( Celtic myth).

Cú Chulainn: The greatest hero in Celtic myths and was one of the principal character in the Ulaid Cycle. Caliburn was the sword in the stone that granted Arthur kingship. There are a number of versions of the story of Cú Chulainn’s birth. Fergus was one of the Red Branch Knights, wielded a magic sword, and was a friend and father figure to the hero Cú Chulainn. The legend of Excalibur is similar to the Irish hero, Cú Chulainn who had a sword named Caladbolg; or to Norse Legend of Sigurd. Aífe (Old Irish, spelled Aoife in Modern Irish, Irish pronunciation: ) is a character from the Ulster Cycle of Irish mythology.She appears in the sagas Tochmarc Emire ("the wooing of Emer") and Aided Óenfhir Aífe ("the death of Aífe's only son"). With the third he hits Cú Chulainn, mortally wounding him. Cu Chulainn (クー・フーリン or クーフーリン, Kuu Fuurin or Kuufuurin) is a demon in the series. Cú Chulainn ties himself to a standing stone to die on his feet, facing his enemies. Cú Chulainn, also spelt Cú Chulaind or Cúchulainn ([kuːˈxʊlˠɪnʲ] (); Irish for "Culann's Hound") and sometimes known in English as Cuhullin / k ə ˈ h ʊ l ᵻ n /, is an Irish mythological hero who appears in the stories of the Ulster Cycle, as well as in Scottish and Manx folklore. When Cu Chulainn’s foes came for the last time against him, his land was filled with smoke and flame, the weapons fell from their racks, and the day of his death drew nigh.

The two legends have blurred into one over time though.