This Leonardo fresco painted in a Milan convent dining hall began crumbling & fading during the artist's lifetime
[DOC] [TLE] Leonardo da Vinci - Artist, Mathematician, Inventor, Writer ... [PAR] Nov 17, 2015 ... A leading figure of the Italian Renaissance, Leonardo da Vinci's work ... 3:14) 
Leonardo da Vinci began apprenticing under the artist Verrocchio.