His own grandson and namesake, Berengar II, who would later be king of Italy as well, fought on the winning side against him.
He then once more turned against Berengar, who was besieged at San Leo.
The first known city walls were built in the 9th century, when thanks to Berengar II of Italy the city gained a wide autonomy, with subsequent economic development and population increase.
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The details of the relations between Sigifred's sons Sigifred II and Adalbert Atto are unknown and the latter appears in Canossa in time to give refuge to Queen Adelaide when she was fleeing Berengar II and Willa in 955.
Willa of Tuscany (died 970), queen consort of Berengar II of Italy