Giorgio Vasari, Lives of the Most Excellent Painters… (1850)
“ It thus happened, that as the Florentine citizen, Giovan-Francesco Rustici, acquitted himself very creditably in his youth, not only in design but in modelling in clay also, so by the Magnificent Lorenzo, who readily perceived his quickness of intellect and good parts, he was placed for the purposes of study with Andrea del Verrocchio, with whom, in like manner, had studied Leonardo da Vinci; the youth of the latter gave evidence, as will be remembered, of the rarest ability, and he was early endowed with extraordinary genius. ”
