Although character is usually best estimated by the evidence of contemporaries speaking from personal knowledge, some allowance must be made for the language of adulation applied to princes by their subjects or favourites. Yet in reference to one whose elevated qualities are so well established as those of Federigo, less caution than usual is requisite in adopting the words of his courtiers, and seldom has the meed of praise been more amply confirmed by the award of posterity. We shall, therefore, willingly give a place to the testimony left by one of the most eminent of his acquaintances. Poggio Bracciolino, who had studied the world in many courts and countries, thus writes of him:--"Besides his rare eloquence and acquirements, and the many excellent personal and mental endowments accorded him by nature, his military skill was especially conspicuous, wherein he was surpassed by no contemporary captain. For who does not know the prudence of his undertakings, the promptitude of his actions, the soundness of his decisions, rendering him as it were the model to our age of those great men of antiquity gifted with all the arts of command?" Francesco di Giorgio, the associate of his studies, and the comrade of his campaigns towards the close of his glorious career, ranks his generalship higher than any known to history from the days of old Rome, and acknowledges himself his debtor for many important suggestions as to fortification. The principle of his tactic was, according to this most competent authority, great caution at the commencement of an engagement, holding himself in readiness to support any point exposed by mistake or failure of a subordinate; and, when such opportunity occurred, an impetuous daring which, "with eyes to see and wings to fly," remedied the mischief and secured the victory. "Considerate of his soldiery, compassionate to the enemy, it was his pleasure to mitigate the horrors and miseries of war. He was liberal and merciful, but uncompromisingly just. An eloquent orator, a most subtle philosopher, an eminent moralist, an expert and ingenious mathematician, his intellectual habits were confirmed by long and constant practice. So intense was his admiration of worth, that he sought to attract to his court and reward every man conspicuous by virtue and attainments. A Mars in the field, a Minerva in his administration, he was equally feared and loved." Such is an abstract of the character which Francesco terms but an atom of the encomium due to his patron.