Sigurd Haraldsson (Old Norse: Sigurðr Haraldsson; 1133 – 10 June 1155), also called Sigurd Munn, was king of Norway (being Sigurd II) from 1136 to 1155. He was son of Harald Gille, king of Norway and his mistress Thora Guttormsdotter (Þóra Guthormsdóttir). He served as co-ruler with his half-brothers, Inge Haraldsson and Eystein Haraldsson. His epithet Munn means "the Mouth" in Old Norse. He was killed in the power-struggle against his brother, Inge, in an early stage of the civil war era in Norway. Reign Sigurd was fostered by Guttorm (Guthormr) or Sådegyrd Bårdsson (Sáðagyrðr Bárðarson) in Trøndelag. When his father was murdered by the pretender Sigurd Slembe in 1136, Sigurd was made king at the thing of Eyrathing. At the same time, his brothers Inge and Magnus were also made kings and co-rulers. Their respective guardians joined forces against Sigurd Slembe and his ally, the former king Magnus the Blind. The battles against these pretenders dominated the early years of Sigurd's reign. In 1139, they were defeated and slain at the Battle of Holmengrå. After this followed a period of peace. During the minority of the brothers, Sigurd, Inge and Magnus, the Norwegian nobility cooperated to rule the kingdom and advise the kings. In 1142, their brother Eystein came to Norway from Scotland. His parentage was accepted, since Harald Gille had acknowledged that he had a son overseas. Eystein thus became king and co-ruler together with Sigurd and Inge. Magnus, of whom little more is known, died of natural causes at some point in the 1140s. In 1152, Norway was visited by the papal legate Nicholas Breakspear. During his visit, the church in Norway was organised into a separate archbishopric, with its seat at Nidaros. As they grew up, and their old advisors died, hostility began to grow among the brothers. In 1155, all three of them were set to meet in Bergen in an effort to keep the peace. Inge accused Sigurd and Eystein of planning to have him dethroned. Sigurd denied the accusations, but a few days later one of Inge's guards was killed by one of Sigurd's. At the advice of his mother Ingrid and his senior advisor, Gregorius Dagsson, Inge ordered his men to assault the house where Sigurd was residing. Sigurd had but few men, and no mercy was given. King Sigurd fell on 6 February 1155. He was buried by the old cathedral