Supposed late 4th-century king of Ireland, who with his son Niall Noígiallach [of the Nine Hostages] makes two of the earliest verifiable rulers in Irish history. Eochaid earned his epithet, ‘Lord of Slaves’, from his many raids into Britain, bringing back slaves to Ireland. According to the story Echtra Mac nEchach Muigmedóin [The Adventure of the Sons of Eochaid Mugmedón], one of these slaves was Cairenn, daughter of a British king, who became the mother of Niall. Eochaid Mugmedón was king at Tara for eight years, extending his sovereignty into what is today counties Meath and Cavan. Powerful families, later rivals, traced their lineage back to Eochaid Mugmedón, the Uí Néill through his son Niall Noígiallach, and the kings of Connacht through his other sons, Ailill (2), Brian (2), and Fiachra (2). He was slain by the three Collas at Dub Chomar (Corleck Hill, Drumeague, Co. Cavan).