The Orkneyinga saga (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. 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.