Imaginary engraving of the philosopher Archelaus of Athens. From the 1580 book Illustrium philosophorum et sapientum effigies ab eorum numistatibus extractae, by Girolamo Olgiati. Reprinted 1583. [Girolamo Olgiati / https://books.google.co.uk/books?id=1urLxOK8pzkC -- Public domain -- http://commons.wikimedia.org/wiki/File:Achelaus Atheniensis - Illustrium philosophorum et sapientum effigies ab eorum numistatibus extractae.png]