I have just discovered the letters of St. Francis of Paola regarding the Great Monarch. The Yves Dupont book quotes from him, but the letters in toto are much more fascinating.
Coincidentally, I recently checked out a book about St. Francis. He is a nearly-forgotten saint who was nevertheless extremely famous in his time -- the 15th century -- and a Padre Pio-like wonderworker who could physically dislocate. There are endless stories of miracles with this man, not just one or two but a nearly constant stream over a long life. For instance, he'd come into a town that was having a drought, he'd tap the ground with a stick to show where the source was, things like that. He founded a now vanished order called the "Minima," meaning "the least."
But it appears he had another role that gives him added relevance in our time -- he was a fervent prophet of the Great Monarch. He wrote several detailed and, I believe, inspired letters on this subject. I was startled to see how he raises belief in the Great Monarch to a sign of divine favor, and of disbelief as a mark of divine disfavor.
My excellent Lord, —
Let your soul rejoice! For his Divine Majesty manifests through you such wonderful signs and great miracles, according to what I, by God’s will, have often and again written and foretold to you. One of your posterity shall achieve greater deeds and work greater wonders than your lordship. That man will be a great sinner in his youth, but like St. Paul he shall be drawn and converted to God. He shall be the great founder of a new religious order different from all the others. He shall divide it into three classes, namely: 1. Military knights; 2. Solitary priests; 3. Most pious hospitallers. This shall be the last religious order in the Church, and it will do more good for our holy religion than all other religious institutes. By force of arms he shall take possession of a great kingdom. He shall destroy the sect of Mahomet, extirpate all tyrants and heresies. He shall bring the world to a holy mode of life. There will be one fold and one Shepherd. He shall reign until the end of time. On the whole Earth there shall be only twelve kings, one emperor, and one pope. Rich gentlemen shall be very few, but all saints. May Jesus Christ be praised and blessed; for he has vouchsafed to grant to me, a poor unworthy sinner, the spirit of prophecy, not in an obscure way as to his other servants, but has enabled me to write and to speak in a most clear manner. I know that unbelieving and reprobate persons will scoff at my letters and will reject them; but they will be received by those faithful Catholic souls who aspire to the possession of Heaven. These letters shall infuse such sweetness of divine love in their hearts, that they will be delighted in perusing them often, and in taking
copies of them, because such is the will of the Most High. In these letters it will be found out who belongs to our blessed Lord Jesus Christ and who does not, who is a predestinate or a reprobate. Much better will this be known through the holy sign of the living God. He shall be a saint of God who will take it, love it, and wear it. Nothing more occurs to me."