After the deaths of some pontiffs, Osporco, a Roman, succeeded to the papacy; but on account of his unseemly appellation, he took the name of Sergius, and this was the origin of that change of names which the popes adopt upon their election to the pontificate.
In the meantime, the Emperor Charles died and was succeeded by Lewis (the Pious), after whose death so many disputes arose among his sons, that at the time of his grandchildren, the house of France lost the empire, which then came to the Germans; the first German emperor being called Arnolfus.

Nor did the Carlovingian family lose the empire only; their discords also occasioned them the loss of Italy; for the Lombards, gathering strength, offended the pope and the Romans, and Arnolfo, not knowing where to seek relief, was compelled to create Berengarius, duke of Fruili, king of Italy.

These events induced the Huns, who occupied Pannonia, to assail Italy; but, in an engagement with Berengarius, they were compelled to return to Pannonia, which had from them been named Hungary.
Romano was at this time emperor of Greece, having, while prefect of the army, dethroned Constantine; and as Puglia and Calabria, which, as before observed, were parts of the Greek empire, had revolted, he gave permission to the Saracans to occupy them; and they having taken possession of these provinces, besieged Rome.

The Romans, Berengarius being then engaged in defending himself against the Huns, appointed Alberic, duke of Tuscany, their leader.

By his valor Rome was saved from the Saracens, who, withdrawing from the siege, erected a fortress upon Mount Gargano, by means of which they governed Puglia and Calabria, and harassed the whole country.