Guy of Namur

https://en.wikipedia.org/wiki/Guy_of_Namur

Guy of Dampierre, Count of Zeeland, also called Guy of Namur (Dutch: Gwijde van Namen) (ca. 1272 – October 13, 1311 in Pavia), a younger son of Guy, Count of Flanders and Isabelle of Luxembourg, was Lord of Ronse.

In 1302, with his father in prison and Flanders under French occupation, he was sent by his elder brother John I, Marquis of Namur, to take command of the rebellion there. He led the troops from western Flanders at the Battle of the Golden Spurs, and received great acclamation for the victory there. https://en.wikipedia.org/wiki/Battle_of_the_Golden_Spurs

He took the title of Count of Zeeland and invaded Zeeland; but the French raised new armies, and he was beaten at the naval Battle of Zierikzee and became a captive of the count of Holland. https://en.wikipedia.org/wiki/Battle_of_Zierikzee

Abandoning his designs on Zeeland, he went on campaign in Italy with his cousin Henry VII, Holy Roman Emperor. There he married Margaret of Lorraine, daughter of Theobald II, Duke of Lorraine. He died soon thereafter, without issue.