Immanuel Kant (1724 - 1804) "Immanuel Kant" by Special Collections at Johns Hopkins University is licensed under CC BY-NC-SA 2.0. VOLTAIRE (1694 - 1778) "'Voltaire' - Jean-Antoine Houdon" by Hetx is licensed under CC BY-NC-ND 2.0. Montesquieu (1689 - 1755) "Portrait du comte Pierre de Montesquiou, Nicolas de Largillière." by Lejeune Grégory is marked with CC0 1.0.