Leonardo da Vinci first met Salai when the latter was about 10 years old. Leonardo would have been about 38 or 40 years old at the time. Sal...

Leonardo da Vinci first met Salai when the latter was about 10 years old. Leonardo would have been about 38 or 40 years old at the time. Salai became an apprentice in Leonardo's studio and remained a companion and assistant to da Vinci for the rest of the artist's life.