Blaise de Vigenère, 16th century French diplomat and cryptologist. Portrait by Thomas de Leu.
From English wikipedia. No copyright due to date of the image.
<bdi><a href="https://en.wikipedia.org/wiki/en:Thomas_de_Leu" class="extiw" title="w:en:Thomas de Leu"><span title="engraver">Thomas de Leu</span></a>
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Woodcut Photograph. No date found.