In the year 1376 Catherine was in her twenty-ninth year; and we then come to the most important and most remarkable incident in her career. At that time Gregory XI., the last of seven French popes, who had succeeded one another in the chair of St. Peter, was living at Avignon, where for the last seventy-three years the Papal Court had resided to the infinite discontent and considerable injury of Italy. To put an end to this absenteeism, and bring back the Pontiff, and all the good things that would follow in his train, was the cherished wish of all good Italians, and especially of all Italian churchmen. Petrarch had urgently pressed Gregory's predecessor, Urban V., to accomplish the desired change; Dante had at an earlier period laboured to accomplish the same object. But it was not altogether an easy step to take. The French Cardinals who surrounded the Pope at Avignon were of course eager to keep him and the Court in their own country. The King of France was equally anxious to detain him. The French Pope's likings and prejudices of course pointed in the same direction. Rome too was very far just then from offering an agreeable or inviting residence. The dominions of the Church were in a state of almost universal rebellion. The turbulence of the great Roman barons was such, that going to live among them seemed as safe and as pleasant as finding a residence in a den of ruffians. Thus all the representations of the Italian Church, and all the spiritual and temporal interests, which so urgently needed the ruler's presence in his dominions, had for some years past not sufficed to bring back the Pope to Rome. Under these circumstances Catherine, the obscure Sienese dyer's illiterate daughter, determined to try her powers of persuasion and argument on the Pontiff, and proceeded to Avignon for that purpose in the summer of 1376. In the September of that same year, the Pope set out on his return to Rome! The dyer's daughter succeeded in her enterprise, and moved the centre of Europe once more back again to its old place in the eternal city! It should seem, that she was also charged by the government of Florence, then at war with the Pope, to make their peace with him. And this object also, though it was not accomplished on the occasion of her visit to Avignon, she appears to have subsequently contributed to bring to a satisfactory termination. But it is remarkable, that in none of the six letters to Gregory, written in the early months of 1376, does she speak a word on the subject of Florence. The great object of her anxiety is the Pope's return to Rome. There are four letters extant written by her[13] to Gregory, while she was in Avignon. But neither in these is the business of the Florentines touched on. So that we must suppose, says Father Burlamacchi in his notes to Letter VII., that this affair was treated by the Pope and the Saint in personal interviews,[14] or in other letters now lost. [Sidenote: HER LETTERS TO POPE GREGORY.]