Philip and his wife Isabella of Portugal at first planned to have Mary betrothed to Charles, Count of Maine, but her father could not pay the dowry. Mary stayed on at the Burgundian court, where Isabella frequently paid for her expenses. Mary attended Isabella's daughter-in-law Catherine of France, while she herself was attended upon by ten people. The duke and duchess then started negotiations for a Scottish marriage. Philip promised to pay her dowry, while Isabella paid for her trousseau. William Crichton came to the Burgundian court to escort her back to Scotland.
Queen of Scotland
Mary landed in Scotland in June 1449 and both nobles and the common people came to see her as she made her way to Holyrood Abbey in Edinburgh. Mary married King James II of Scotland at Holyrood Abbey on 3 July 1449. A sumptuous banquet was given, while the Scottish king gave her several presents. Immediately after the marriage ceremony, she was dressed in purple robes and crowned queen by Abbot Patrick. It had been agreed that any sons they might have would have no right to the duchy of Guelders. Queen Mary was granted several castles and the income from many lands from James, which made her independently wealthy. In May 1454, she was present at the siege of Blackness Castle, and when it resulted in the victory of the king, he gave it to her as a gift. She made several donations to charity, such as when she founded a hospital just outside Edinburgh for the indigent; and to religion, such as when she benefited the Franciscan friars in Scotland.
Regency
After her husband's death, Mary ruled as regent for their son James III of Scotland until her own death three years later. Mary was drawn into the Wars of the Roses taking place in England at this time. She appointed Bishop James Kennedy as her chief advisor; their companionship was described as well-functioning despite the fact that the bishop favoured an alliance with the Lancastrians, while Mary at first wanted to continue playing off the warring parties in England against each other. While Mary was still mourning the death of her husband, the English queen of the House of Lancaster, Margaret of Anjou, fled north across the border seeking refuge from the Yorkists. Mary sympathetically aided Margaret and took Edward of Westminster into her household to keep them out of Yorkist hands. Mary's dealings with Margaret were mainly to provide aid to the deposed queen. Mary gave a number of Scottish troops to help Margaret and the Lancastrian cause. Mary and Margaret also organised a betrothal between Margaret's son, Edward, and Mary's daughter Margaret in 1461. In return for her support, Mary asked for the town of Berwick on the Anglo-Scottish border, which Margaret was willing to give up. Relations between the two women deteriorated, however, with the increasingly friendly alliance between King Edward IV of England and Duke Philip of Burgundy. Any support by Mary for Margaret, Edward IV's enemy, threatened the alliance that Philip wanted with Edward IV against King Louis XI of France. Edward IV tried to put a stop to Mary's support of Margaret by proposing marriage to the widowed queen, which Mary rejected. Mary's uncle, Duke Philip, pressured her to call off the betrothal of her daughter and Margaret's son, to Margaret's disappointment. In 1462, she paid the Lancastrian royals to leave Scotland and made peace with Edward IV. She also hinted at the possibility of a marriage between herself and the new English king. Mary, reportedly, had several affairs during her period as regent, notably one with the Lord Hailes. Mary went ahead with James II's plan to build a castle on land at Ravenscraig, designed to withstand the use of artillery, and lived in it while it was under construction until her death.
Mary founded Trinity College Church ca. 1460 in memory of her husband. The church, located in the area now known as Edinburgh's Old Town, was demolished in 1848 to make way for Waverley station, although it was partially reconstructed on a different site in 1870 under the name Trinity Apse. Mary was buried in the church, and her coffin was moved to Holyrood Abbey in 1848.
Margaret, who married William Crichton, 3rd Lord Crichton of Auchingoul. She became the mother of Margaret Crichton and mother-in-law of George Leslie, 4th Earl of Rothes.
David Stewart, Earl of Moray. He was created Earl of Moray on 12 February 1456.
