Mary of Guelders (Dutch: Maria van Gelre; c. 1434/1435 – 1 December 1463) was Queen of Scots by marriage to King James II.

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.

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.

[11] 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.

Relations between the two women deteriorated, however, with the increasingly friendly alliance between King Edward IV of England and Duke Philip of Burgundy.

[12] Mary went ahead with James II's plan to build a castle on land at Ravenscraig,[13] designed to withstand the use of artillery, and lived in it while it was under construction until her death.

[13] 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.

Upon her death, Mary was at first interred at Trinity College Church, but her body was moved to Holyrood Abbey in Edinburgh when discovered in 1848.

However, Laing raised the possibility that the skeleton discovered at Trinity College Church and assumed to be the queen was not, in fact, Mary of Guelders.

He argued that another female skeleton, discovered in a more prominent location in the church, and more likely to have been the site of a royal burial, could well have been Mary.