His relationship to the Looz family is confirmed by the Gesta Abbatem Trudonensium which names "Baldricus secundus…frater Ghiselbertus", when recording the former's installation as Bishop of Liège, read together with another part of the same passage which names "Baldricus secundus…filius Ottonis comitis de Los ex Lutgarde filia Hermegardis Namurcensis comitissæ…".... [No] other reference has been found to the father of Giselbert and Baldric being named Otto. Europäische Stammtafeln shows Giselbert and his brothers as sons of Rudolf, although from a chronological point of view this seems unlikely to be correct.
Comte de Looz. “Gislebertus et Arnulfus comites fratres mei, Wigerus advocatus, Godefridus de Florines...” witnessed the charter dated 1015 of Baldric Bishop of Liège relating to Hanret and Celles. "Baldricus…Leodiensis ecclesiæ sacerdos" founded the abbey of Liège Saint-Jacques, in the presence of "fratribus meis Gisleberto…comite de Los et Arnulfo", by charter dated 1016, witnessed by "…Arnulfus comes frater comitis Gisleberti". “Comitibus hiis: Hecelone, Henrico, Gisilberto, Sibodone, Arnulfo” subscribed the charter dated 1029 under which Poppo Archbishop of Trier deplored damage caused to monasteries and donated “ecclesiam Longuion” to the abbey of Notre-Dame-des-Martyrs. It is not certain whether “Gisilberto” was Giselbert Comte de Duras or Giselbert Comte de Looz. A charter dated 1031, which records that "Godeschalkus præpositus" founded the church of Saint-Barthélemy near Liège, states that “Baldricus episcopus” had granted “allodium de Butines...de Aila” to “fratris sui Gisleberti comtiis de Lon”. "Chonradus…Romanorum imperator augustus" confirmed property "in Alsatia et in comitatibus Gisilberti et Wezilonis comitum" to Kloster Peterlingen by charter dated 1027. "Domina Adelaydis comitissa uxor quondam Hludovici comitis" donated property to Verdun Saint-Vanne by undated charter, subscribed by "Gislebertus comes". 1
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