Family
 Slani ingen Briain of Dál Cais 1)Daughter of Brian Bóruma mac Cennétig of Dál Cais, High King of Ireland, King of Munster and Unknown. Notes: Sláine ingen Briain was the daughter of Brian Boru, High King of Ireland, and wife of Sigtrygg Silkbeard, King of Dublin. Sláine was married to Sigtrygg after his defeat at Glen Máma in 999 to unite Dublin and Munster forces following a failed rebellion by Sigtrygg and others. They had one son, Olaf Sigtryggsson. The most well known reference to Sláine is in the Cogadh Gáedhel re Galliabh. Married/ Related to:  Sitric mac Amlaíb of Dublin 1)Born ± 970 Died 1042, approximately 72 years Notes: Sigtrygg II Silkbeard Olafsson (also Sihtric, Sitric and Sitrick in Irish texts; or Sigtryg and Sigtryggr in Scandinavian texts) was a Hiberno-Norse king of Dublin (possibly AD 989-994; restored or began 995-1000; restored 1000 and abdicated 1036) of the Uí Ímair dynasty. He was caught up in the abortive Leinster revolt of 999-1000, after which he was forced to submit to the King of Munster, Brian Boru. His family also conducted a double marriage alliance with Boru, although he later realigned himself with the main leaders of the Leinster revolt of 1012-1014. He has a prominent role in the 12th-century Irish Cogadh Gaedhil re Gallaibh and the 13th century Icelandic Njal's Saga, as the main Norse leader at the Battle of Clontarf in 1014. Child: 1. Amlaíb mac Sitric of Dublin, King of Dublin 1)Died 1034 Notes: 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 held to ransom 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. | |||
Sources
1) Source: Llywelyn ap Iorwerth ancestor table . External Linkhttp://sites.rootsweb.com/~medieval/llywelyn.htm (Data from secondary evidence)