The Roots of Romanticism is the long-awaited text of Isaiah Berlin's most celebrated set of lectures, the Mellon Lectures, delivered in Washington in 1965 and heard since by a much wider audience on BBC radio. For Berli, the Romantics set in train a vast, unparalleled revolution in humanity's view of itself. They destroyed the traditional notion of objective truth in ethicsm with incalculable, all-pervasive results. In his unscripted tour de force Berlin surveys the myriad attempts to define romanticism, distils its essence, traces its development, and shows how its legacy permeates our outlook today.