Separately from Sláine, Sigtrygg had five children: Artalach (d. 999), Oleif (d. 1013), Godfrey (d. 1036), Glúniairn (d. 1031) and Cellach (d. 1042). The annals record the death of Oleif—"son of the lord of the foreigners"—who was killed in revenge for the burning of Cork. Glúniairn was killed by the people of South Brega in 1031. Godfrey was killed in Wales in 1036 by one Sitric, "son of Glúniairn"—as factionalism was common among Viking settlers, this could have been the same Glúniairn as Sigtrygg's half-brother, thus making Godfrey and his killer cousins. Sigtrygg's daughter Cellach died in the same month as her father.