His father died when he was very young and it was at Neufchâtel that his uncle Ebles II, Count of Roucy, raised him.
As a member of the household of Archbishop Raoul le Vert, Barthélemy witnessed a number of charters.
[1] In 1113 Barthélemy was elected bishop of Laon with the support of Anselm, dean of the cathedral canons and was consecrated in the metropolitan city of Rheims on Easter Sunday in the presence of King Louis VI.
According to ancient documents, the first shrine of Notre-Dame de Liesse was built by Barthélemy, with the stones left over from the construction of Laon Cathedral.
Also in 1128, the Templars established a commandery in Laon with the support of the bishop and the agreement of Pope Honorius II.
At the Council of Reims in October 1119, Pope Calixtus II requested Norbert of Xanten to found a religious order in the Diocese of Laon in France.