This man, born in Florence of the most noble family of the Alberti, of which we have spoken in another place, devoted himself not only to studying geography and the proportions of antiquities, but also to writing, to which he was much inclined, much more than to working. He was excellent in arithmetic and geometry, and he wrote ten books on architecture in the Latin tongue, which were published by him in 1481, and may now be read in a translation in the Florentine tongue made by the Reverend Maestro Cosimo Bartoli, Provost of S. Giovanni in Florence. He wrote three books on painting, now translated into the Tuscan tongue by Messer Lodovico Domenichi; he composed a treatise on traction and on the rules for measuring heights, as well as the books on the "Vita Civile," and some erotic works in prose and verse; and he was the first who tried to reduce Italian verse to the measure of the Latin, as is seen in the following epistle by his pen:
Questa per estrema miserabile pistola mando A te, che spregi miseramente noi.
Arriving at Rome in the time of Nicholas V, who had turned the whole of Rome upside down with his manner of building, Leon Batista, through the agency of Biondo da Forlì, who was much his friend, became intimate with that Pope, who had previously carried out all his building after the advice of Bernardo Rossellino, a sculptor and architect of Florence, as will be told in the Life of his brother Antonio. This man, having put his hand to restoring the Pope's Palace and to certain works in S. Maria Maggiore, thenceforward, according to the will of the Pope, ever sought the advice of Leon Batista. Wherefore, using one of them as adviser and the other as executor, the Pope carried out many useful and praiseworthy works, such as the restoring of the conduit of the Acqua Vergine, which was in ruins; and there was made the fountain on the Piazza de' Trevi, with those marble ornaments that are seen there, on which are the arms of that Pontiff and of the Roman people.
Afterwards, having gone to Signor Sigismondo Malatesti of Rimini, he made for him the model of the Church of S. Francesco, and in particular that of the façade, which was made of marble; and likewise the side facing towards the south, which was built with very great arches and with tombs for the illustrious men of that city. In short, he brought that building to such a form that in point of solidity it is one of the most famous temples in Italy. Within it are six most beautiful chapels, one of which, dedicated to S. Jerome, is very ornate; and in it are preserved many relics brought from Jerusalem. In the same chapel are the tombs of the said Signor Sigismondo and of his wife, constructed very richly of marble in the year 1450; on one there is the portrait of Sigismondo himself, and in another part of the work there is that of Leon Batista.