In the execution of his design, Sigismondo received the assistance of one of the most remarkable men of this or any other age. Leo Battista Alberti, a scion of the noble Florentine house of that name, born during the exile of his parents, and educated in the Venetian territory, was endowed by nature with aptitudes, faculties, and sensibilities so varied, as to deserve the name of universal genius. Italy in the Renaissance period was rich in natures of this sort, to whom nothing that is strange or beautiful seemed unfamiliar, and who, gifted with a kind of divination, penetrated the secrets of the world by sympathy. To Pico della Mirandola, Lionardo da Vinci, and Michel Agnolo Buonarroti may be added Leo Battista Alberti. That he achieved less than his great compeers, and that he now exists as the shadow of a mighty name, was the effect of circumstances. He came half a century too early into the world, and worked as a pioneer rather than a settler of the realm which Lionardo ruled as his demesne. Very early in his boyhood Alberti showed the versatility of his talents. The use of arms, the management of horses, music, painting, modelling for sculpture, mathematics, classical and modern literature, physical science as then comprehended, and all the bodily exercises proper to the estate of a young nobleman, were at his command. His biographer asserts that he was never idle, never subject to ennui or fatigue. He used to say that books at times gave him the same pleasure as brilliant jewels or perfumed flowers: hunger and sleep could not keep him from them then. At other times the letters on the page appeared to him like twining and contorted scorpions, so that he preferred to gaze on anything but written scrolls. He would then turn to music or painting, or to the physical sports in which he excelled. The language in which this alternation of passion and disgust for study is expressed, bears on it the stamp of Alberti's peculiar temperament, his fervid and imaginative genius, instinct with subtle sympathies and strange repugnances. Flying from his study, he would then betake himself to the open air. No one surpassed him in running, in wrestling, in the force with which he cast his javelin or discharged his arrows. So sure was his aim and so skilful his cast, that he could fling a farthing from the pavement of the square, and make it ring against a church roof far above. When he chose to jump, he put his feet together and bounded over the shoulders of men standing erect upon the ground. On horseback he maintained perfect equilibrium, and seemed incapable of fatigue. The most restive and vicious animals trembled under him and became like lambs. There was a kind of magnetism in the man. We read, besides these feats of strength and skill, that he took pleasure in climbing mountains, for no other purpose apparently than for the joy of being close to nature.