of the Hebrides rebelled. Harald then sent Ketill Flatnose to subdue them. Ketill achieved this quickly but then declared himself an independent "King of the Isles", a title he retained for the rest of his life. Hunter (2000) states that Ketill was "in charge of an extensive island realm and, as a result, sufficiently prestigious to contemplate the making of agreements and alliances with other princelings". According to the Landnámabók Kettil became ruler of a region already settled by Scandinavians. Some scholars believe that this entire story is apocryphal and based on the later voyages of Magnus Barelegs. For example, Woolf (2007) suggests that his appearance in the sagas "looks very much like a story created in later days to legitimise Norwegian claims to sovereignty in the region" and suggests an early-11th-century creation of the earldom of Orkney, prior to which local warlords competed for influence with one another and local populations of farmers. Nonetheless, the Norse tradition states that Rognvald Eysteinsson received Orkney and Shetland from Harald as an earldom as reparation for the death of his son in battle in Scotland, and then passed the earldom on to his brother Sigurd the Mighty. Sigurd's line barely survived him and it was Torf-Einarr, Rognvald's son by a slave, who founded a dynasty that controlled the Northern Isles for centuries after his death. He was succeeded by his son Thorfinn Turf-Einarsson and during this time the deposed Norwegian king Eric Bloodaxe often used Orkney as a raiding base before being killed in 954. Thorfinn's death and presumed burial at the broch of Hoxa, on South Ronaldsay, then led to a long period of dynastic strife. Whatever the historical details, it seems likely that Orkney and Shetland were being rapidly absorbed into Norse culture by this time. The evidence of toponymy and language is unequivocal. Placenames in Orkney with a Celtic derivation are few in number and it is clear that Norn, a local version of Old Norse, was widely spoken by the inhabitants into historic times. Norn was also spoken in Shetland and evidence for Pictish elements in placenames is virtually non-existent, the three island names of Fetlar, Unst and Yell excepted. Jarlshof in Shetland contains the most extensive remains of a Viking site visible anywhere in Britain and it is believed that the Norse inhabited the site continuously from the 9th to the 14th centuries. Amongst the many important