This thesis examines the roles of the sublime and the beautiful in the works of eighteenth-century French landscape painter Claude-Joseph Vernet. An introduction to the study, a history of the sublime and beautiful, and an overview of the way these ideas are portrayed in Vernet's calm and storm pendants are provided. How commissions for these pendants relate to theoretical developments of the sublime and beautiful and how Vernet became aware of the these ideas are addressed. The thesis shows Vernet was not dependent on British patrons or on the century's most influential aesthetic treatise on the sublime and the beautiful by Edmund Burke, because Vernet started painting such themes well before Burke's treatise (1757) and did so in response to French patrons.