Sadb ingen Chuinn was a daughter of Conn of the Hundred Battles, a High King of Ireland. She married firstly Macnia mac Lugdach, prince of the Dáirine or Corcu Loígde, and was mother of Lugaid Mac Con, High King of Ireland. Upon the death of Macnia, she married secondly Ailill Aulom, king of southern Ireland, and was mother of Éogan Mór, ancestor of the Eóganachta. Her brother was Art mac Cuinn, also a High King of Ireland, while her sister Sáruit married Conaire Cóem of the Érainn, who was High King before him.