In 1308, he married Mahaut of Chatillon (1293?1358), daughter of Guy III of Châtillon, Count of Saint Pol. They had also four children:
Marie of Valois (1309?1332). Married Charles, Duke of Calabria and had issue.
Isabella de Valois (1313 ? August 26, 1388). She married Peter I, Duke of Bourbon.
Blanche of Valois (1317?1348). She married Charles IV, Holy Roman Emperor. Sometimes called "Marguerite".
Louis, Count of Chartres (1318?1328)
She was a daughter of Guy III of Châtillon and Marie of Brittany. Her maternal grandmother was Beatrice of England, Beatrice was a daughter of Henry III of England and Eleanor of Provence.
Sources
Royal Ancestry by Douglas Richardson Vol. III page 32
Royal Ancestry by Douglas Richardson Vol. V page 232
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