The consorts of the monarchs of Scotland bore titles derived from their marriage. The Kingdom of Scotland was first unified as a state by Kenneth I of Scotland in 843, and ceased to exist as an independent kingdom in after the Act of Union 1707, when it was merged with the Kingdom of England to become the Kingdom of Great Britain.
The early history of Scotland is confused and often obscure, due largely to information given by the sources of the time and after, which are often contradictory, vague, and lacking in detail. Details of the kings prior to Malcolm III are sparse, and the status of two – Giric and Eochaid – dubious; details of their wives are almost non-existent. Thus, it is practically impossible to construct a list of consorts of Scotland prior to the accession of Macbeth, whose wife Gruoch is well-documented and somewhat notorious.
Although a few details of earlier queens consort are known – for example, Duncan I was married to a woman named in one source as Suthen – the first queen about whom much is known is Gruoch, a daughter of Boite mac Cináeda, himself a son of either Kenneth II or Kenneth III. Her son was Lulach; the mother of Máel Snechtai of Moray, Lulach's son, was still alive in 1078, when she was seized by Malcolm Canmore, but nothing else is known of her, not even if she and Lulach were married.
In 1058, Malcolm Long-neck of the House of Dunkeld overthrew his cousin, Lulach, and reclaimed the Scottish throne for himself. His family, the House of Dunkeld, would rule until the death of Alexander III in 1286, with whom the House ended. Alexander's heir was his infant granddaughter, Margaret, "the Maid of Norway", of the House of Fairhair; but she died, still unmarried and childless, in late 1290 before reaching Scotland, and was never crowned at Scone. After two years of Interregnum, the controversial John de Balliol was chosen as king (his wife was already dead, and never became queen consort); but after four years of reign, he abdicated, and Scotland entered another Interregnum until 1306.