German philosophy
Neo-Kantianism refers broadly to the revival of the type of philosophy explained by Immanuel Kant and of the interpretations of Kant provided by post-Kantian philosophers such as Schopenhauer, Jakob Friedrich Fries and Johann Friedrich Herbart. Major figures in the neo-Kantian movement, which began around the 1860s, include Friedrich Albert Lange and Hermann Cohen.
19th-century philosophy
One of the first philosophers to attempt to grapple with Kant's philosophy was Johann Gottlieb Fichte, whose development of Kantian metaphysics became a source of inspiration for the Romantics. In "Wissenschaftslehre", Fichte argues that the self posits itself and is a self-producing and changing process.