Born in 1322 to John I of Namur and his wife Marie of Artois.
She had three sisters, including Blanche of Namur, Queen consort of Sweden and Norway, and seven brothers.
In 1335/36, she married her first husband, Henry II, Graf of Vianden, son of Philip II, Graf of Vianden and his first wife Lucia von der Neuerburg.
Her second marriage in 1340 (dispensation 9 September 1342) was to her father's second cousin, Theobald of Bar, Seigneur de Pierrepont, son of Erard of Bar, Seigneur de Pierrepont et d'Ancerville (himself son of Theobald II of Bar), and his wife Isabelle of Lorraine (daughter of Theobald II, Duke of Lorraine).
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