Ruling Ivrea (923–50)
Berengar was a son of Margrave Adalbert I of Ivrea and his wife Gisela of Friuli, daughter of the Unruoching king Berengar I of Italy. He succeeded his father as margrave about 923 and married Willa, daughter of the Bosonid margrave Boso of Tuscany and niece of King Hugh of Italy. The chronicler Liutprand of Cremona, raised at Berengar's court at Pavia, gives several particularly vivid accounts of her character.
About 940 Berengar led a revolt of Italian nobles against the rule of his uncle. To evade an assault by Hugh's liensmen, he, forewarned by the king's young son Lothair, had to flee to the court of King Otto I of Germany. Otto avoided taking sides; nevertheless, in 945 Berengar was able to return to Italy with hired troops, welcomed by the local nobility. Hugh was defeated and retired to Arles, and he was nominally succeeded by Lothair. From the time of Berengar's successful uprising, all real power and patronage in the Kingdom of Italy was concentrated in his hands, with Hugh's son Lothair as titular king. Lothair's brief reign ended upon his early death in 950, presumably poisoned.