Still today, Leonardo's relations with his contemporaries are unclear as well as the considerable influence exerted on him by his predecessors. Like other Renaissance artists, Leonardo surely studied works of classical art and his declared admiration for Giotto and Masaccio is as significant as his implicit esteem of Brunelleschi. Although Verrocchio is known as his master, he was undoubtedly influenced also by the Pollaiolo and by the works of Flemish artists. In his manuscripts he mentioned some of the greatest artists of the time as friends, and he had a shop and a school whose importance was underestimated in the past. Leonardo's influence is particularly evident in the works of the Florentine shops active in the last decades of the 15th century. His heritage fell to the Mannerists in the first decades of the 16th century.