He had four children (three sons) by Margaret and the eldest took part in the
War of the Succession of Flanders and Hainault: •
William III,
Count of Flanders and Lord of
Kortrijk •
Guy, Count of Flanders and
Margrave of Namur •
John I, Lord of Dampierre,
Viscount of
Troyes, and Constable of Champagne •
Joanna, married in 1239 to
Hugh III of Rethel, then in 1243 to
Theobald II of Bar ==References==