[4] Arras had previously been part of the diocese of Cambrai but count Robert II of Flanders had instigated the founding of the bishopric to weaken the influence of the emperor in the region.
[5] After Lamberts election, he summoned many wise men to him to aid him in his task, among them John of Warneton, a regular canon at Mont Saint-Éloi Abbey and another former pupil of Ivo of Chartres, who later became bishop of Thérouanne.
[6] Lambert maintained friendships with his former teacher Ivo as well as with Archbishop Anselm of Canterbury who both esteemed him highly and lent him their political and moral support.
[11] Lambert collaborated closely with his fellow bishops John of Thérouanne, Godfrey of Amiens, Manasses of Reims and Odo of Tournai, something even recognised by pope Paschal II who relied on them to resolve some of the regions most protracted legal disputes.
[8] The many petitions Lambert received from bishops, clergy and laypeople in the region show that he both acted and was perceived as highly influential person.