Andrea Palladio (30 November 1508 – 19 August 1580) was an Italian architect active in the Republic of Venice. Palladio, influenced by Roman and Greek architecture, primarily by Vitruvius, is widely considered the most influential individual in the history of Western architecture. All of his buildings are located in what was the Venetian Republic, but his teachings, summarized in the architectural treatise, The Four Books of Architecture, gained him wide recognition. The city of Vicenza and the Palladian Villas of the Veneto are UNESCO World Heritage Sites.