Óláfr Hrólfson, of Gairsay

He ruled Gairsay as Steward (Gøding) of Páll II (about 1123-1136), the Norse Jarl of Orkney. In 1135, Oláfr joined his ship with Jarl Páll's fleet in an attack on Olvir Rosta, a chieftain from Sutherland who was seeking a share of the Orkney earldom. The Orcadians defeated Olvir in a sea battle off Tankerness on the Orcadian mainland. After the battle, the Jarl gave Oláfr charge of Duncansby in Caithness. In retaliation for his defeat, Olvir launched a surprise raid on Oláfr's residence in Caithness in 1136, where he burned down the house around Oláfr's head.