Mentioned in the Chronicle of Fredegar, the Duchy of Dentelin included far north-western parts of modern France and south-western parts of Belgium. The cities of Boulogne-sur-Mer, Thérouanne, Tournai, Arras, and Cambrai lay within the duchy.
Chlothar, who outlasted his rival kinsmen and became sole Frankish king, retained Dentelin when he installed his son Dagobert I as king of Austrasia in 623. When Dagobert died in 639, Dentelin was included in Neustria, and remained part of that kingdom afterwards.
- (French) Meriaux, Charles. "Thérouanne et son diocèse jusqu’à la fin de l’époque carolingienne". Bibliothèque de l'école des Chartes, volume 158, issue 2. Retrieved 2007-08-02.
- (French) Riché, Pierre, Dictionnaire des Francs: Les Carolingiens, sv "Dentelin (Duché de)". Bartillat, 1997. ISBN 2-84100-125-3