Duke Frederick was a prince remarkable among Italian despots for private virtues and sober use of his hereditary power. He spent his youth at Mantua, in that famous school of Vittorino da Feltre, where the sons and daughters of the first Italian nobility received a model education in humanities, good manners, and gentle physical accomplishments. More than any of his fellow-students Frederick profited by this rare scholar's discipline. On leaving school he adopted the profession of arms, as it was then practised, and joined the troop of the Condottiere Niccolò Piccinino. Young men of his own rank, especially the younger sons and bastards of ruling families, sought military service under captains of adventure. If they succeeded they were sure to make money. The coffers of the Church and the republics lay open to their not too scrupulous hands; the wealth of Milan and Naples was squandered on them in retaining-fees and salaries for active service. There was always the further possibility of placing a coronet upon their brows before they died, if haply they should wrest a town from their employers, or obtain the cession of a province from a needy Pope. The neighbours of the Montefeltri in Umbria, Romagna, and the Marches of Ancona were all of them Condottieri. Malatestas of Rimini and Pesaro, Vitelli of Città di Castello, Varani of Camerino, Baglioni of Perugia, to mention only a few of the most eminent nobles, enrolled themselves under the banners of plebeian adventurers like Piccinino and Sforza Attendolo. Though their family connections gave them a certain advantage, the system was essentially democratic. Gattamelata and Carmagnola sprang from obscurity by personal address and courage to the command of armies. Colleoni fought his way up from the grooms to princely station and the _bâton_ of S. Mark. Francesco Sforza, whose father had begun life as a tiller of the soil, seized the ducal crown of Milan, and founded a house which ranked among the first in Europe.