According to "Njál's saga", Gormflaith "egged on her son Sigtrygg very much to kill King Brian", sending him to win the support of Earl Sigurd of Orkney, and Bróðir and Óspak of Man at any price. Sigtrygg arrived in Orkney for Sigurd's Yule feast, where he sat in a high seat between the two brothers-in-law, Earl Sigurd of Orkney and Earl Gilli of the Southern Isles. The saga also records that Sigtrygg was very interested in the Burning of Njáll Þorgeirsson at Bergþórshvoll and what had happened since. Afterwards, Sigtrygg bade Sigurd to go to war with him against Brian. Despite Sigurd's initial hesitance and against the advice of his men, he eventually agreed to arrive in Dublin by Palm Sunday with all his men, on the condition that if Brian was slain, Sigurd would marry Gormflaith and become King of Ireland.