Giorgio Vasari was an Italian Renaissance painter and architect, who is best known for his work Lives of the Most Excellent Painters, Sculptors, and Architects, considered the ideological foundation of all art-historical writing, and still much cited in modern biographies of the many Italian Renaissance artists he covers, including Leonardo da Vinci and Michelangelo, although he is now regarded as including many factual errors, especially when covering artists from before he was born.