This thesis examines the history and development of the Picturesque, its definition, theoreticians, and practitioners; and its influence on romanticism. The focus is the correction of pejorative and negative assessments common in modern literary studies which provide a misleading interpretation of both the Picturesque and its influence. The goal is a broader understanding which suggests the necessity of a new evaluation of Wordsworth's "groundbreaking" contribution to literary development. Accordingly, an extensive introductory section examines pre-Picturesque and Picturesque painting, outlining the beginnings of a new and particularly English aesthetic. Also, an exploration of pre-Picturesque poetry and formative Picturesque poetry reveals the literary ramifications of this aesthetic. Finally, Wordsworth and Keats are canvassed within the Picturesque context: Wordsworth to demonstrate the origins and erroneousness of the modern critical bias and the way his poetry was often formulated according to Picturesque principles; Keats to demonstrate the longevity and continuing importance and influence of the Picturesque. Conclusions are conclusive.