Overview
Margaret of England (29 September 1240 – 26 February 1275) was Queen of Scots by marriage to King Alexander III.
Life
Margaret was the second child of King Henry III of England and his wife, Eleanor of Provence, and was born at Windsor Castle. Margaret's first appearance in historical record comes when she was three years old, when she and her brother, the future Edward I, took part in an event in London.
King Alexander II of Scotland had previously been married to her paternal aunt, Joan of England. In 1244, her father and Alexander II met in Newcastle to resume peaceful relations between the two nations, and it was decided that the future Alexander III of Scotland should marry Margaret. She was betrothed the same year.
She was married on 25 December 1251, when she was 11 years old, at York Minster, to King Alexander III of Scotland, who was 10 years of age. The couple remained in York until January of the following year, when they continued their residence in Edinburgh.
From Wikipedia (CC BY-SA 4.0).