This collection of new essays, the first of its kind in English, considers the ways in which the philosophy of Immanuel Kant engages with the views of lesser-known eighteenth-century German thinkers. Each chapter casts new light on aspects of Kant's complex relationship with these figures, particularly with respect to key aspects of his logic, metaphysics, epistemology, theory of science, and ethics. The portrait of Kant that emerges is of a major thinker thoroughly engaged with his contemporaries - drawing on their ideas and approaches, targeting their arguments for criticism and responding to their concerns, and seeking to secure the legacy of his thought among them. This volume will open the door for further research on Kant and his methods of philosophical inquiry, while introducing readers to the distinctive and influential philosophical contributions of several previously neglected figures.