He was a member of the dynasty known to historians as the Giselbertiners (or Giselbertini).
[1] He is first documented as count of Bergamo in 961 (although he probably had held the position for some time before this).
[2] Giselbert supported Otto I, Holy Roman Emperor against Berengar II of Italy.
As a reward, in 970 Otto I granted Giselbert II property in the counties of Bergamo, Brescia, Como and Pavia, which had been confiscated from Count Bernard of Pavia.
[4] With his wife, Anselda (or Alsinda) of Turin, daughter of Arduin Glaber, Giselbert II had several children, including: