This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Christiaanhuygens. Physicist Christiaan Huygens detail from Etablissement de l'Acadmie des Sciences et fondation de l'observatoire leidenuniv nl htm It is not entirely certain that this is Huygens but the circumstantial evidence seems strong and it looks lot like other portraits of him See the web page referenced above for more