Immanuel Kant was born on April 22, 1724, in Königsberg, Prussia (now Kaliningrad, Russia). He is one of the most significant philosophers in the history of Western philosophy. His contributions to metaphysics, epistemology, ethics, and aesthetics have had a profound impact on almost every philosophical movement that followed him. Kant's most notable work, 'Critique of Pure Reason', critically examines the foundation of human knowledge and is considered one of the most important philosophical works. He never married and spent most of his life in his birth city. Kant died on February 12, 1804.