Earl of Orkney in the context of King of Man and the Isles

The Kingdom of the Isles, also known as Sodor, was a Norse–Gaelic kingdom comprising the Isle of Man, the Hebrides and the islands of the Clyde from the 9th to the 13th centuries. The islands were known in Old Norse as the Suðreyjar, or "Southern Isles" as distinct from the Norðreyjar or Northern Isles of Orkney and Shetland. In Scottish Gaelic, the kingdom is known as Rìoghachd nan Eilean. The territory is sometimes called the Kingdom of Mann and the Isles, although only some of the later rulers claimed that title. The historical record is incomplete, and the kingdom was not a continuous entity throughout the entire period. At times the rulers were independent of external control, although for much of the period they had overlords in Norway, Ireland, England, Scotland or Orkney. At times there also appear to have been competing claims for all or parts of the territory. The islands have a total land area of over 8,300 square kilometres (3,205 sq mi) and extend for more than 500 kilometres (310 mi) from north to south.

Viking influence in the area began in the late 8th century, and whilst there is no doubt that the Uí Ímair dynasty played a prominent role in this early period, the records for the dates and details of the rulers are speculative until the mid-10th century. Hostility between the Kings of the Isles and the rulers of Ireland, and intervention by the crown of Norway (either directly or through their vassal the Earl of Orkney) were recurring themes.

The Earldom of Orkney was a Norse territory ruled by the earls (or jarls) of Orkney from the ninth century until 1472. It was founded during the Viking Age by Viking raiders and settlers from Scandinavia (see Scandinavian Scotland). In the ninth and tenth centuries it covered the Northern Isles (Norðreyjar) of Orkney and Shetland, as well as Caithness and Sutherland on the mainland. It was a dependent territory of the Kingdom of Norway until 1472, when it was absorbed into the Kingdom of Scotland. Originally, the title of Jarl or Earl of Orkney was heritable.

Scandinavian Scotland was the period from the 8th to the 15th centuries during which Vikings and Norse settlers, mainly Norwegians and to a lesser extent other Scandinavians, and their descendants colonised parts of what is now the periphery of modern Scotland. Viking influence in the area commenced in the late 8th century, and hostility between the Scandinavian earls of Orkney and the emerging thalassocracy of the Kingdom of the Isles, the rulers of Ireland, Dál Riata and Alba, and intervention by the crown of Norway were recurring themes.

Scandinavian-held territories included the Northern Isles of Orkney and Shetland, the Hebrides, the islands of the Firth of Clyde and associated mainland territories including Caithness and Sutherland. The historical record from Scottish sources is weak, with the Irish annals and the later Norse sagas, of which the Orkneyinga saga is the principal source of information, sometimes contradictory although modern archaeology is beginning to provide a broader picture of life during this period.

The Battle of Clontarf (Irish: Cath Chluain Tarbh) took place on 23 April 1014 at Clontarf, near Dublin, on the east coast of Ireland. It pitted an army led by Brian Boru, High King of Ireland, against a Norse-Irish alliance comprising the forces of Sigtrygg Silkbeard, King of Dublin; Máel Mórda mac Murchada, King of Leinster; and a Viking army from abroad led by Sigurd of Orkney and Brodir of Mann. It lasted from sunrise to sunset, and ended in a rout of the Viking and Leinster armies.

It is estimated that between 7,000 and 10,000 men were killed in the battle, including most of the leaders. Although Brian's forces were victorious, Brian himself was killed, as were his son Murchad and his grandson Toirdelbach. Leinster king Máel Mórda and Viking leaders Sigurd and Brodir were also slain. After the battle, the power of the Vikings and the Kingdom of Dublin was largely broken.

Donnchad mac Máel Coluim (Modern Gaelic: Donnchadh mac Mhaoil Chaluim; anglicised as Duncan II; c. 1060 – 12 November 1094) was King of Alba. He was son of Malcolm III (Máel Coluim mac Donnchada) and his first wife Ingibiorg Finnsdottir, widow of Thorfinn Sigurdsson, earl of Orkney.
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The Orkneyinga saga (Old Norse: [ˈorknˌœyjeŋɡɑ ˈsɑɣɑ]; Scottish Gaelic: Seanchas Arcach nan Lochlannach; also called the History of the Earls of Orkney and Jarls' Saga) is a narrative of the history of the Orkney and Shetland islands and their relationship with other local polities, particularly Norway and Scotland, written in Old Norse. The saga has "no parallel in the social and literary record of Scotland" and is "the only medieval chronicle to have Orkney as the central place of action". The main focus of the work is the line of jarls who ruled the Earldom of Orkney, which constituted the Norðreyjar or Northern Isles of Orkney and Shetland and there are frequent references to both archipelagoes throughout.

The narrative commences with a brief mythical ancestry tale and then proceeds to outline the Norse take-over of the Norðreyjar by Harald Fairhair – the take-over is not in doubt although the role of the king is no longer accepted by historians as a likelihood. The saga then outlines, with varying degrees of detail, the lives and times of the many jarls who ruled the islands between the 9th and 13th centuries. The extent to which the earlier sections in particular can be considered genuine history rather than fiction has been much debated by scholars.