Although Leonardo described him as "a liar, a thief, stubborn and a glutton" and he stole from Leonardo on at least five occasions, he kept him in his household for more than 25 years, in which he trained as an artist.
على الرغم من أن ليوناردو وصفه بأنه كاذب ولص وعنيد وشره، وأنه سرق منه خمس مرات على الأقل، إلا أنه أبقاه في منزله لأكثر من 25 عاماً، حيث درّبه كفنان.