Kant's idealism first came to prominence during the pantheism controversy in 1785-1786. When the controversy arose, Kant had already published the first (A) edition of the Critique of Pure Reason (1781) and the Prolegomena to Any Future Metaphysics (1783).

When was idealism created?

The sage Yajnavalkya (possibly 8th century BCE) is one of the earliest exponents of idealism, and is a major figure in the Brihadaranyaka Upanishad.

What is the history of idealism?

Idealism is philosophy on a grand scale, combining micro and macroscopic problems into systematic accounts of everything from the nature of the universe to the particulars of human feeling. In consequence, it offers perspectives on everything from the natural to the social sciences, from ecology to critical theory.