Isabelle of Luxembourg

Isabelle of Luxembourg (1247–1298) was a countess consort of Flanders and a marquis consort of Namur by marriage to Guy of Dampierre.

Isabelle of Luxembourg
Bornc. 1247
Diedc. 1298
SpouseGuy of Dampierre
John I, Marquis of Namur
Guy of Namur
HouseHouse of Luxembourg
FatherHenry V of Luxembourg
MotherMargaret of Bar


She was the daughter of Henry V of Luxembourg and Margaret of Bar.[1] Isabelle was a member of the House of Luxembourg. Isabelle was the third of seven children.


In March 1265, Isabelle married Guy of Dampierre.[2] Her marriage was determined by events that occurred many years before her birth. Indeed, around 1165, her great-grandfather Henry IV the Blind, Count of Namur and Luxembourg, had no children from his first marriage. He named his brother Baldwin IV of Hainaut as his successor. Baldwin died in 1171, and Henry the Blind confirmed his nephew Baldwin V of Hainaut. But with one more attempt to have children, Henry the blind married his second wife, Agnes of Gelderland, who bore a daughter, Ermesinde and thus had broken the promise he had made to Baldwin. A war ensued, with the result that Baldwin would be Henry's designated heir in Namur.

Isabelle's father claimed his rights of Namur, being son of Ermesinde. Henry V failed on his claim to rule Namur. Isabelle's parents wanted to make peace with Guy over a dispute of Namur. Isabelle became Guy's second wife; his first wife, Matilda had died one year earlier. Guy already had eight children with Matilda.

Guy arranged a marriage between their daughter Philippa and Edward, Prince of Wales. However, Philip IV of France imprisoned Guy and two of his sons, forced him to call off the marriage, and imprisoned Philippa in Paris until her death in 1306. Guy was summoned before the king again in 1296, and the principal cities of Flanders were taken under royal protection until Guy paid an indemnity and surrendered his territories, to hold them at the grace of the king.

Isabelle died in the September 1298, and her husband six years later, in 1304.


Guy and Isabelle had:


  1. Arblaster 2012, p. 81.
  2. Verbruggen 2002, p. 8.
  3. Fegley 2002, p. 104.
  4. Pollock 2015, p. 167.


  • Arblaster, Paul (2012). A History of the Low Countries. Palgrave Macmillan.
  • Fegley, Randall (2002). The Golden Spurs of Kortrijk: How the Knights of France Fell to the Foot Soldiers of Flanders in 1302. McFarland & Co.
  • Pollock, M.A. (2015). Scotland, England and France After the Loss of Normandy, 1204-1296. The Boydell Press.
  • Verbruggen, J. F. (2002). DeVries, Kelly (ed.). The Battle of the Golden Spurs (Courtrai, 11 July 1302). Translated by Ferguson, David Richard. Boydell Press.

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