9 Handed down by their Father and Lawgiver, the heritage of such devotion to this See passed to the children. As often, therefore, as, through the infatuated minds of men, the Church had to suffer from popular movements or the tyranny of princes, this Apostolic See had in the Dominicans, the defenders of truth and justice, a most opportune help in the preservation and honor of its authority. Who does not know the glorious deeds in that connection of the Dominican Virgin, Catherine of Sienna? Urged by the charity of Jesus Christ she persuaded the Roman Pontiff, what no one else had been able to do, to return to his Roman See after an interval of seventy years. Afterwards, while the Western Church was torn by a dire schism, she kept a great number of Christians in loyal obedience to the legitimate Pontiff.
Source: Fausto Appetente Die (Vatican.va)