Plato

(c. 428 - 348 B.C.) Greek

Epicurus

(341 - 270 B.C.) Greek

Friedrich Nietzsche

(1844 - 1900) German

Immanuel Kant

(1724 - 1804) German

Jeremy Bentham

(1749 - 1832) English

Marcus Aurelius

(A.D. 121 -180) Roman