The house of Namur is a family of the Lotharingian nobility, coming from Berenger count of Lommegau.
He married a sister of Giselbert duke of Lotharingia, from the House of Reginar.
Vita Gerardi abbatis Broniensis states that the descendants of Berenger continued to hold the county of Namur, but the relationship between Berengar and his successor Robert I is not known.
The latter gave Durbuy to his second son and Namur to his first son Albert III, Count of Namur, who married Ida from the House of Billung, heiress of La Roche-en-Ardenne.
Henry IV the Blind, the last male member of the House, died in 1196.