Margaret of Flanders
Margaret of Flanders (1272–1331) was a daughter of Guy of Dampierre, Count of Flanders, and Isabelle of Luxembourg. In 1282 she married Alexander, Prince of Scotland, at Roxburgh, but the prince died in 1284 and Margaret returned to Flanders in 1285.
In 1286 she married at Namur Reginald I, Count of Guelders, bearing him six children, including Reginald II, who became the first Duke of Guelders in 1339, after her death in 1331.