Three sketches of the head of a man by Leonardo da Vinci, executed during the period in which he worked as chief engineer and architect for Cesare Borgia, who is thought to be the subject.
<bdi><a href="https://en.wikipedia.org/wiki/en:Leonardo_da_Vinci" class="extiw" title="w:en:Leonardo da Vinci"><span title="Italian Renaissance polymath (1452−1519)">Leonardo da Vinci</span></a>
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<a rel="nofollow" class="external autonumber" href="http://www.theborgiaswiki.wetpaint.com">[1]</a>