I suspect that Petrarch's free language in favour of the Tribune Rienzo was not unconnected with their alienation.
Notwithstanding Petrarch's declared dislike of Avignon, there is every reason to suppose that he passed the greater part of the winter of 1346 in his western Babylon; and we find that he witnessed many interesting scenes between the conflicting cardinals, as well as the brilliant fetes that were given to two foreign princes, whom an important affair now brought to Avignon.

These were the King of Bohemia, and his son Charles, Prince of Moravia, otherwise called Charles of Luxemburg.
The Emperor Lewis of Bavaria, who had previously made several but fruitless attempts to reconcile himself with the Church, on learning the election of Clement VI., sent ambassadors with unlimited powers to effect a reconcilement; but the Pope proposed conditions so hard and humbling that the States of the German Empire peremptorily rejected them.

On this, his Holiness confirmed the condemnations which he had already passed on Lewis of Bavaria, and enjoined the Electors of the empire to proceed to a new choice of the King of the Romans.

"John of Luxemburg," says Villani, "would have been emperor if he had not been blind." A wish to secure the empire for his son and to further his election, brought him to the Pope at Avignon.
Prince Charles had to thank the Pontiff for being elected, but first his Holiness made him sign, on the 22nd of April, 1346, in presence of twelve cardinals and his brother William Roger, a declaration of which the following is the substance:-- "If, by the grace of God, I am elected King of the Romans, I will fulfil all the promises and confirm all the concessions of my grandfather Henry VII.

and of his predecessors.