Indeed! There is no harm in holding it, especially since the people who espoused this "idea"in the past were approved mystics and theologians.
Here is one of the Visions of Venerable Holzhauser, published in 1646. These were apparently read in the presence of the Holy Roman Emperor Ferdinand III and Duke Maximilian I, Elector of Bavaria, who were soon to participate in the negotiations of the Peace of Westphalia beginning that year. One of those visions struck me:
books.google.co.uk/books?id=…dq=bartholomew
You won’t find this one on those Trad websites but its genuine whereas many of the ones they exchange are baseless.
As for St. Bonaventure, the Seraphic Doctor.
To cut a long story short, he predicts that the Church will endure a minor tribulation followed by a era of peace prior to the Great Apostasy and Second Coming. This Era of Peace will involve the promised full evangelization of the nations. He relates this to the period of the Jews being released from Babylonian Captivity and states that just as the Temple was restored after the exile before Christ, so to must the Church Miliant undergo a great “restoration” before the end characterised by the greatest ever spread of the Gospel. He equates future periods of the Church with past events of the Old Testament, which he understood to be types foreshadowing the former.
He indicates that for this to transpire, a Great Monarch - a ruler, defender of the Church - will arise: