Quartigod son of Cú Chulainn (demigod) by the warrior-woman Aífe of Alba. Born after Cú Chulainn's departure from Alba; raised by his mother under three Cú Chulainn-imposed geasa: come to Ireland when the thumb-ring fits his finger; reveal his name to no man; refuse no challenge — the canonical-Old-Irish three-geasa structural-tragic-engine. At age seven arrived in Ireland in a bronze boat with golden oars (the canonical-Otherworldly-arrival iconography); overcame Conall Cernach in single combat; was killed by his unknowing father Cú Chulainn with the Gáe Bulg at the ford and recognized only as he was dying through the thumb-ring token. The canonical Old Irish son-killed-by-father tragic-recognition tale-type — structurally parallel to the Persian Rostam-and-Sohrab and the Greek Hyllus-and-Tlepolemus patterns per cross-cultural folkloric analysis. Primary source: Aided Óenfhir Aífe (text dated late 9th / early 10th c.; preserved in the Yellow Book of Lecan, 15th c.). The killing closes the structural-tragic frame of the Cú Chulainn cycle and provides the canonical "Here, Ulstermen, is my son for you" anagnorisis-at-death scene.