Sadb ingen Chuinn was a daughter of Conn of the Hundred Battles, a 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.
Alternatively, as in the Cath Maige Mucrama, she was the wife only of Ailill Aulom and mother of Éogan Mór, Cormac Cas, Cian, and Lugaid Mac Con's foster-mother.
Possibly referred to in the Acallam na Senórach, Sadb is described as "one of the four best women that man ever lay with".
[3] Sadhbh, mother of Oisín and wife of Fionn mac Cumhaill, may in part derive from her.