The Florentines after the war of Serezana, lived in great prosperity until 1492, when Lorenzo de’ Medici died; for he having put a stop to the internal wars of Italy, and by his wisdom and authority established peace, turned his thoughts to the advancement of his own and the city’s interests, and married Piero, his eldest son, to Alfonsina, daughter of the Cavaliere Orsino. He caused Giovanni, his second son, to be raised to the dignity of cardinal. This was the more remarkable from its being unprecedented; for he was only fourteen years of age when admitted to the college; and became the medium by which his family attained to the highest earthly glory. He was unable to make any particular provision for Guiliano, his third son, on account of his tender years, and the shortness of his own life. Of his daughters, one married Jacopo Salviati; another, Francesco Cibo; the third, Piero Ridolfi; and the fourth, whom, in order to keep his house united, he had married to Giovanni de’ Medici, died. In his commercial affairs he was very unfortunate, from the improper conduct of his agents, who in all their proceedings assumed the deportment of princes rather than of private persons; so that in many places, much of his property was wasted, and he had to be relieved by his country with large sums of money. To avoid similar inconvenience, he withdrew from mercantile pursuits, and invested his property in land and houses, as being less liable to vicissitude. In the districts of Prato, Pisa, and the Val di Pesa, he purchased extensively, and erected buildings, which for magnificence and utility, were quite of regal character. He next undertook the improvement of the city, and as many parts were unoccupied by buildings, he caused new streets to be erected in them, of great beauty, and thus enlarged the accommodation of the inhabitants. To enjoy his power in security and repose, and conquer or resist his enemies at a distance, in the direction of Bologna he fortified the castle of Firenzuola, situated in the midst of the Appennines; toward Sienna he commenced the restoration and fortification of the Poggio Imperiale; and he shut out the enemy in the direction of Genoa, by the acquisition of Pietra Santa and Serezana.