Before leaving Rome at the age of twenty-four, Valla tried to get the post of Apostolic Secretary, but without success. It is probable that his youth told less against him than his reputation for plain speech and fearlessness. In 1431 we hear of him at Pavia, where, according to the slanders of his enemies,[249] he forged a will and underwent public penance at the order of the Bishop. This, however, is just one of those stories on which the general character of the invectives that contain it, throws uncertainty. Far more to our purpose is the fact that at this period he became the supreme authority on points of Latin style in Italy by the publication of his 'Elegantiæ.' True to his own genius, Valla displayed in this masterly treatise the qualities that gave him a place unique among the scholars of his day. The forms of correct Latinity which other men had picked out as they best could by close adherence to antique models, he subjected to critical analysis, establishing the art of style on scientific principles. [Footnote 249: Poggio and Fazio are the authorities for this incident.] When Alfonso invited Valla to Naples in 1437, giving him the post of private secretary, together with the poet's crown, he must have known the nature of the man who was to play so prominent a part in the history of free thought. It is not improbable that the feud between the House of Aragon and the Papal See, which arose from Alfonso's imperfect title to the throne of Naples, and was embittered by the intrigues of the Church, disposed the King to look with favour on the uncompromising antagonist of Papacy. At all events, Valla's treatise on 'Constantine's Donation,' which appeared in 1440, assumed the character of a political pamphlet.[250] The exordium contained fierce personal abuse of Eugenius IV. and Cardinal Vitelleschi. The body of the tract destroyed the fabric of lies which had imposed upon the Christian world for centuries. The peroration ended with a menace. Worse chastisement was in store for a worldly and simoniacal priesthood, if the Popes refused to forego their usurped temporalities, and to confess the sham that criticism had unmasked. War to the death was thus declared between Valla and Rome. The storm his treatise excited, raged at first so wildly that Valla thought it prudent to take flight. He crossed the sea to Barcelona, and remained there a short while, until, being assured of Alfonso's protection, he once more returned to Naples. From beneath the shield of his royal patron, he now continued to shoot arrow after arrow at his enemies, affirming that the letter of Christ to Abgarus, reported by Eusebius, was a palpable forgery, exposing the bad Latin style of the Vulgate, accusing S. Augustine of heresy on the subject of predestination, and denying the authenticity of the Apostles' Creed. That a simple humanist, trusting only to his learning, should have dared to attack the strong places of orthodoxy--its temporalities, its favourite code