Jean-Marie Guyau (28 October 1854 – 31 March 1888) was a French philosopher and poet.
Guyau was inspired by the philosophies of Epicurus, Epictetus, Plato, Immanuel Kant, Herbert Spencer, and Alfred Fouillée, and the poetry and literature of Pierre Corneille, Victor Hugo, and Alfred de Musset.
Eduard Gottlob Zeller (German: [ˈtsɛlɐ]; 22 January 1814, Kleinbottwar – 19 March 1908, Stuttgart) was a German philosopher and Protestant theologian of the Tübingen School of theology. He was well known for his writings on Ancient Greek philosophy, especially Pre-Socratic Philosophy, and most of all for his celebrated, multi-volume historical treatise The Philosophy of Greeks in their Historical Development (1844–52). Zeller was also a central figure in the revival of neo-Kantianism.