Spinoza House in The Hague, where Spinoza lived from 1670 until his death in 1677 — Photo Credit: By MLWatts - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=46079106
Ethics, in the posthumous Latin first edition — opening page of Spinoza's magnum opus Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=730730
The Works of Jacob Behmen — 18th-century illustration by Dionysius Andreas Freher for the book Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=57449504
Only surviving page from the first draft of the Manifesto, handwritten by Karl Marx — Photo Credit: https://en.wikipedia.org/wiki/The_Communist_Manifesto#/media/File:Iishmarx.jpg
Friedrich Engels in 1868 — Photo Credit: By George Lester, Manchester photographer - Public Domain, https://commons.wikimedia.org/w/index.php?curid=1195844