https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13971067![Franciscus Sylvius [Deleboe]. Line engraving, 1720, after C. van Dalen.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djYTRmNjN5MjMtaW1hZ2UuanBn.jpg)
Franciscus Sylvius [Deleboe]. Line engraving, 1720, after C. van Dalen.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use