University College Utrecht —
Photo Credit: By Raph2009 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=6366653

Utrecht University logo —
Photo Credit: By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=37401565

Frederick William, Elector of Brandenburg — cropped from The Elector by Frans Luycx
Photo Credit: By Frans Luycx - Kunsthistorisches Museum Wien, Bilddatenbank., Public Domain, https://commons.wikimedia.org/w/index.php?curid=4629286

William I, the Silent, Prince of Orange —
Photo Credit: By Adriaen Thomasz Key - Unknown, Public Domain, https://commons.wikimedia.org/w/index.php?curid=29982157

The Academy building of Leiden University in 1614 — Illustrium Hollandiae Westfrisiae ordinum alma academia Leidensis / Dedication portraits and portraits of Leiden professors, along with 4 scenes of university, library, anatomical room & hortus
Photo Credit: By Jacob Marci and Justum a Colster - File:Academia Leidensis.jpg / https://books.google.nl/books?id=8Wo_AAAAcAAJ, Public Domain, https://commons.wikimedia.org/w/index.php?curid=46247222

Leiden University logo —
Photo Credit: By Leiden University - The logo may be obtained from Leiden University., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=81284970

Pieter van Musschenbroek —
Photo Credit: By Hieronymus van der Mij (1687-1761) - Public Domain, https://commons.wikimedia.org/w/index.php?curid=24256572

Galvani's experments on the frog — Late 1780s diagram of Galvani's experiment on frog legs
Photo Credit: By Luigi Galvani - https://commons.wikimedia.org/w/index.php?curid=55077832

Experiment De viribus electricitatis in motu musculari — Luigi Galvani experiment on frogs legs. Original link (no more available): http://www.ieee-virtual-museum.org/collection/people.php?id=1234675&lid=1
Photo Credit: By Luigi Galvani - Public Domain, https://commons.wikimedia.org/w/index.php?curid=2809107

Electrodes touch a frog, and the legs twitch into the upward position — Luigi Galvani discovered that frog's legs twitch when electricity is passed through the muscles, a phenomenon called galvanism that lead to the subject of electrophysiology and treatment by electrotherapy.
Photo Credit: By Luigi Galvani - Public Domain, https://commons.wikimedia.org/w/index.php?curid=36497119

Luigi Galvani —
Photo Credit: By Unidentified painter - Public Domain, https://commons.wikimedia.org/w/index.php?curid=2707375