He was related to two prior archbishops: Andrea da Canziano (died 906) and Garimpert, his father and predecessor, who involved him in the administration of the diocese before 921.
Lambert, along with Marquis Adalbert I of Ivrea and Count Giselbert of Bergamo, led a rebellion against King Berengar I in 921, sparking a long civil war over the Italian throne.
Berengar's use of Hungarians as troops raised great indignation and the rebels offered the throne to King Rudolf II of Burgundy.
[1] Lambert sent troops to the Battle of Firenzuola (29 July 923), where Rudolf established himself on the Italian throne.
[3] When in 926 Duke Burchard II of Swabia invaded Italy in support of Rudolf, Lambert invited him to Milan while secretly arranging his ambush.