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

Life Electric — A contemporary sculpture, dedicated to the physicist Alessandro Volta.
Completed in 2015 it is located in Como, Italy.
Life Electric was designed by Daniel Libeskind
Photo Credit: By Rehman Abubakr, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=50199338

Tempio Voltiano — Volta Temple is a museum dedicated to Alessandro Volta, a prolific scientist and the inventor of the electrical battery.
It is located in his hometown of Como, Italy, and was designed by Federico Frigerio.
It was completed in 1927 to celebrate the 100th anniversary of Volta's death.
Photo Credit: By Daniel Case (talk) - I (Daniel Case (talk)) created this work entirely by myself., CC BY-SA 3.0, https://en.wikipedia.org/w/index.php?curid=56390746