Run, King of Strathclyde, but his mother was a daughter of Kenneth I. Evidence of his reign is unclear. He may have never actually been king and if he was, he was co-king with Giric. ¤Amlaíb is known only by a reference to his death in 977, which reports him as King of Alba; since Kenneth II is known to have still been King in 972–973, Amlaíb must have taken power between 973 and 977. House of Dunkeld (1034–1286) Duncan succeeded to the throne as the maternal grandson of Malcolm II. The House of Dunkeld was therefore closely related to the House of Alpin. Duncan was killed in battle by Macbeth, who had a long and relatively successful reign. In a series of battles between 1057 and 1058, Duncan's son Malcolm III defeated and killed Macbeth and Macbeth's stepson and heir Lulach, claiming the throne. The dynastic feuds did not end there: on Malcolm III's death in battle, his brother Donald III, known as "Bán", claimed the throne, expelling Malcolm III's sons from Scotland. A civil war in the family ensued, with Donald III and Malcolm III's son Edmund opposed by Malcolm III's English-backed sons, led first by Duncan II and then by Edgar. Edgar triumphed, sending his uncle and brother to monasteries. After the reign of David I, the Scottish throne was passed according to rules of primogeniture, moving from father to son, or where not possible, brother to brother. House of Sverre (1286–1290) The status of Margaret, Maid of Norway, as a Scottish monarch is debated by historians. One of her biographers, Archie Duncan, argues that because she was "never inaugurated, she was never queen of Scots". Another, Norman H. Reid, insists that Margaret was "accepted as queen" by her contemporaries but that, owing to the lack of Inauguration, "[her] reign never started". First Interregnum (1290–1292) Monarchy of Scotland restored House of Balliol (1292–1296) The death of Margaret of Norway began a two-year interregnum in Scotland caused by a succession crisis. With her death, the descent of William I became extinct and there was no obvious heir. Thirteen candidates presented themselves; the most prominent were John Balliol, great-grandson of William I's younger brother David of Huntingdon, and Robert de Brus, 5th Lord of Annandale, David of Huntingdon's grandson. The Scottish magnates invited Edward I of England to arbitrate the claims. He did so but forced the Scots to