Olaf Sigtryggsson

Amlaíb mac Sitriuc ("Amhlaeibh, son of Sitric") or Olaf Sigtryggsson was the son of Sigtrygg Silkbeard, the Hiberno-Norse King of Dublin, and Sláine, the daughter of Brian Boru. A member of the Uí Ímair dynasty, his ancestors also included Amlaíb Cuarán and Gormflaith, who were influential in medieval Ireland. He was ransomed by the Gaelic lord of Brega and later killed in England by Anglo-Saxons while on his way on pilgrimage to Rome in 1034. Some of his descendants later became the Kings of Gwynedd in Wales.

Amlaíb was the son of the ruling King of Dublin, Sigtrygg Silkbeard (d. 1042), and his wife Sláine, daughter of the King of Munster and High King of Ireland, Brian Boru (d. 1014), and his first wife. His paternal grandfather was Amlaíb Cuarán (d. 981), the powerful King of York and of Dublin. Amlaíb Cuarán's wife was Gormflaith (d. 1030), a "beautiful, powerful and intriguing Irish woman" who later married Boru at the same time Sigtrygg married Sláine.

Amlaíb had four half-brothers: Artalach (d. 999), Oleif (d. 1013), Godfrey (d. 1036), Glúniairn (d. 1031). Oleif was killed in immediate vengeance for the burning of the Norse city of Cork. Glúniairn was killed by the people of South Brega in 1031. Godfrey was killed in Wales, possibly by a first cousin. Amlaíb was outlived by his half-sister Cellach, who died in 1042 in the same month as her father.

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