Although Alberic was a supporter of Pope Sergius, around 906, when the Pope agreed to crown Berengar Holy Roman Emperor, Alberic allied with his neighbour, Adalbert II, margrave of Tuscany.
In 906, despite his support for Pope Sergius, Alberic chose to ally himself with Adalbert II, the margrave of Tuscany, when the Pope decided to crown Berengar as Holy Roman Emperor.