John III, Marquis of Namur

John succeeded his elder brother William II as Marquis of Namur, when William died without children in 1418.

John never married, but had an illegitimate son with his cousin Cécile of Savoy: Philip of Namur, seigneur de Dhuy (died 1449).^[2]

John III led a very luxurious life, and he had to raise taxes to finance his expenses. This led to revolts and high debts, which forced John to sell his County to Philip the Good, Duke of Burgundy (23 April 1421) for 30.000 golden crowns and the clause that he could benefit from the usufruct of his former county.^[2] Philip the Good incorporated Namur into the Burgundian Netherlands, thus ending the existence of an independent County of Namur.

• C. Piot, art. Jean III, in Biographie Nationale 10 (1889), coll. 309-311.