After having passed the summer of 1330 at Lombes, the Bishop returned to Avignon, in order to meet his father, the elder Stefano Colonna, and his brother the Cardinal.
The Colonnas were a family of the first distinction in modern Italy. They had been exceedingly powerful during the popedom of Boniface VIII., through the talents of the late Cardinal James Colonna, brother of the famous old Stefano, so well known to Petrarch, and whom he used to call a phoenix sprung up from the ashes of Rome. Their house possessed also an influential public character in the Cardinal Pietro, brother of the younger Stefano. They were formidable from the territories and castles which they possessed, and by their alliance and friendship with Charles, King of Naples. The power of the Colonna family became offensive to Boniface, who, besides, hated the two Cardinals for having opposed the renunciation of Celestine V., which Boniface had fraudulently obtained. Boniface procured a crusade against them. They were beaten, expelled from their castles, and almost exterminated; they implored peace, but in vain; they were driven from Rome, and obliged to seek refuge, some in Sicily and others in France. During the time of their exile, Boniface proclaimed it a capital crime to give shelter to any of them.
The Colonnas finally returned to their dignities and property, and afterwards made successful war against the house of their rivals, the Orsini.
John Colonna, the Cardinal, brother of the Bishop of Lombes, and son of old Stefano, was one of the very ablest men at the papal court. He insisted on our poet taking up his abode in his own palace at Avignon. "What good fortune was this for me!" says Petrarch. "This great man never made me feel that he was my superior in station. He was like a father or an indulgent brother; and I lived in his house as if it had been my own." At a subsequent period, we find him on somewhat cooler terms with John Colonna, and complaining that his domestic dependence had, by length of time, become wearisome to him. But great allowance is to be made for such apparent inconsistencies in human attachment. At different times our feelings and language on any subject may be different without being insincere. The truth seems to be that Petrarch looked forward to the friendship of the Colonnas for promotion, which he either received scantily, or not at all; so it is little marvellous if he should have at last felt the tedium of patronage.