Mary Stewart, 1st Countess of Buchan
- Born: 1425, Perth, Perthshire, Scotland
- Marriage (1): Wolfart Van Borsselen VI, Count of Grand Pr
- Died: Mar 20, 1465, Kstl Sandenburch, Veere, Zeeland, Netherlands at age 40
- Buried: Sandenburg, ter Veere, Zeeland, Netherlands
 FamilySearch ID: M1N7-V6Z.
Mary married Wolfart Van Borsselen VI, Count of Grand Pr. (Wolfart Van Borsselen VI, Count of Grand Pr was born in 1433 in Well, Limburg, Netherlands, died on Apr 20, 1486 in Saint-Omer, Calvados, Basse-Normandie, France and was buried in May 1486 in Veere, Zeeland, Netherlands.)
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