Cennini, Cennino (chān-nēˈnō chān-nēˈnē) [key], c.1370–1440, Florentine painter, follower of Agnolo Gaddi. None of his paintings is extant. He is most famous for having written the Libro dell'arte (written 1400?, tr., The Craftsman's Handbook, 1933). This treatise marks a transition between medieval and Renaissance concepts of art. Closely following the tradition of Giotto, he offers detailed advice about the established technique of painting. At the same time, Cennini was one of the first to call for imagination in art and to advocate the elevation of painting from artisanship to the fine arts.