When the principality was governed by William, the troubles of Italy were in some measure abated; but the Saracens still held Sicily, and plundered the coasts of Italy daily.

On this account William arranged with the princes of Capua and Salerno, and with Melorco, a Greek, who governed Puglia and Calabria for the Greek emperor, to attack Sicily; and it was agreed that, if they were victorious, each should have a fourth part of the booty and the territory.

They were fortunate in their enterprise, expelled the Saracens, and took possession of the island; but, after the victory, Melorco secretly caused forces to be brought from Greece, seized Sicily in the name of the emperor, and appropriated the booty to himself and his followers.

William was much dissatisfied with this, but reserved the exhibition of his displeasure for a suitable opportunity, and left Sicily with the princes of Salerno and Capua.

But when they had parted from him to return to their homes, instead of proceeding to Romagna he led his people towards Puglia, and took Melfi; and from thence, in a short time, recovered from the Greek emperor almost the whole of Puglia and Calabria, over which provinces, in the time of pope Nicholas II.