Duras and St Truiden are in the modern province of Belgian Limburg.
His parents were Count Giselbert of Duras and his wife Gertrud.
(In the 19th century Wolters for example identified Juliane as Otto's sister, but this seems unlikely given the succession of the Counts of Duras.)
Juliane and Godfried had five children, the eldest of which was Gilles, Count of Montaigu, Duras, and Clermont, who married Lauretta, daughter of Louis I, Count of Loon.
None of Juliane's sons had male heirs, and the family inheritance split up after their deaths.