The rule of Sixtus was as vigorous as it was scandalous. To say--as has been said--that with his succession to St. Peter’s Chair came for the Church a still sadder time than that which had preceded it, is not altogether true. Politically, at least, Sixtus did much to strengthen the position of the Holy See and of the Pontificate. He was not long in giving the Roman factions a taste of his stern quality. If he employed unscrupulous means, he employed them against unscrupulous men--on the sound principle of similia similibus curantur--and to some extent they were justified by the ends in view. He found the temporal throne of the Pontiffs tottering when he ascended it. Stefano Porcaro and his distinguished following already in 1453 had attempted the overthrow of the pontifical authority, inspired, no doubt, by the attacks that had been levelled against it by the erudite and daring Lorenzo Valla. This Valla was the distinguished translator of Homer, Herodotus, and Thucydides, who more than any one of his epoch advanced the movement of Greek and Latin learning, which, whilst it had the effect of arresting the development of Italian literature, enriched Europe by opening up to it the sources of ancient erudition, of philosophy, poetry, and literary taste. Towards the year 1435 he drifted to the court of Alfonso of Aragon, whose secretary he ultimately became. Some years later he attacked the Temporal Power and urged the secularization of the States of the Church. “Ut Papa,” he wrote, “tantum Vicarius Christi sit, et non etiam Coesari.” In his De falso credita et ementita Constantini Donatione, he showed that the decretals of the Donation of Constantine, upon which rests the Pope’s claim to the Pontifical States, was an impudent forgery, that Constantine had never had the power to give, nor had given, Rome to the Popes, and that they had no right to govern there. He backed up this terrible indictment by a round attack upon the clergy, its general corruption and its practices of simony; and as a result he fell into the hands of the Inquisition. There it might have gone very ill with him but that King Alfonso rescued him from the clutches of that dread priestly tribunal. Meanwhile, he had fired his petard. If a pretext had been wanting to warrant the taking up of arms against the Papacy, that pretext Valla had afforded. Never was the temporal power of the Church in such danger, and ultimately it must inevitably have succumbed but for the coming of so strong and unscrupulous a man as Sixtus IV to stamp out the patrician factions that were heading the hostile movement. His election, it is generally admitted, was simoniacal; and by simony he raised the funds necessary for his campaign to reestablish and support the papal authority. This simony of his, says Dr. Jacob Burckhardt, “grew to unheard-of proportions, and extended from the appointment of cardinals down to the sale of the smallest benefice.”