Cosimo I de' Medici, Grand Duke of Tuscany
As the first Italian art historian, Vasari initiated the genre of an encyclopedia of artistic biographies that continues today. Vasari's work was first published in 1550 by Lorenzo Torrentino in Florence, and dedicated to Cosimo I de' Medici, Grand Duke of Tuscany. It included a valuable treatise on the technical methods employed in the arts. It was partly rewritten and enlarged in 1568 and provided with woodcut portraits of artists (some conjectural).