"I Quattro Libri dell'Architettura," or "The Four Books of Architecture," is a seminal work written by the Italian architect Andrea Palladio in the 16th century. This influential text outlines Palladio's architectural principles and designs, emphasizing symmetry, proportion, and the use of classical elements. It serves as a guide for architects and builders, showcasing various building types, including villas, temples, and urban structures. The book is divided into four sections, each focusing on different aspects of architecture. It includes detailed illustrations and practical advice, making it accessible to both professionals and enthusiasts. "I Quattro Libri" has significantly impacted Western architecture, inspiring countless architects and movements, including Neoclassicism.