Of the works of other surviving authors, the oldest is a sketch probably made by Raphael before 1505 (he was also present in Florence at the time), although it is difficult to think of it as a copy, since at the time Leonardo was still working on his work: more likely, therefore, that Raphael's drawing was simply inspired by the Battle of Anghiari, but does not represent a faithful copy. Then there are other drawings that may have been taken from the original cardboard: We have one in The Hague...
Leonardo received an informal base education. As a teenager he became an apprentice in an art workshop, where he mastered the humanities and technical sciences necessary for work. As he was a bastard he wasn’t allowed to University. All his knowledge he received by himself. У Леонардо было базовое образование, подростком он стал подмастерьем в художественной мастерской, где осваивал гуманитарные и технические науки, необходимые для работы. Но так как он был незаконнорожденным, поэтому просто не имел право учиться в университете...