Boniface held views of the papal power of the most exalted kind. It was in accordance with these that he once more made Rome the headquarters of the papacy. But he soon found himself involved in a quarrel which, purely local in origin, assumed an European importance. The family of Colonna by favour of Pope Nicholas IV had become one of the most powerful in Rome and the neighbourhood. The centre of the family property was the city of Palestrina. Cardinal Jacopo Colonna, who as the eldest brother administered it, did not distribute it fairly to his brothers, but rather favoured his nephews, the sons of his dead brother John who had been Senator of Rome. One of these was the Cardinal Peter. Uncle and nephew were the most influential members of the Roman Curia, and as Roman nobles they resented Boniface's design of humbling the Roman aristocracy. They refused the papal admonitions to deal justly with the other members of the family; they withdrew from the papal Court, and having already turned from Ghibelline to Guelf, they once more became Ghibelline and made an alliance with Frederick of Sicily. They published a manifesto in which they refused to recognise Boniface on the ground that Pope Celestine's abdication had been unlawful. But Celestine was dead and the Colonnas had voted for his successor. Boniface deposed the Cardinals and excommunicated them, even declaring a crusade against them! The struggle centred round Palestrina, and it is said that the Pope fetched from a Franciscan cloister a once famous Ghibelline general, Guy of Montefeltro, by whose advice he decoyed the Colonnas out of their fortress by promises which he did not intend to keep. Palestrina was levelled to the ground and the Colonnas fled (1298), finding refuge among the enemies of Boniface and preparing the way for the final catastrophe. [Sidenote: Papal Jubilee.]