It is unclear if Henry I inherited the county from one of his parents (his father was the Count of Namur and his mother the daughter of Gothelo the Great, Duke of Lorraine) or from his wife.
With some caveats discussed below, the countship progressed as follows: The succession from Henry to Waleran is somewhat murky.
Childless, Henry designated his brother-in-law Baldwin IV, Count of Hainaut, as his heir.
Baldwin V still claimed his inheritance, but record of his using the title Count of Durbuy is lacking.
The Treaty of Dinant, signed 6 July 1199 at Saint Medard, returned the lands to Ermesinda.