Italian painter. He was one of the most important painters of the 14th century and like his slightly younger contemporary, Giotto, was a major influence on the course of Italian painting. An innovator, he introduced into Sienese painting new altarpiece designs, a dramatic use of landscape, expressive emotional relationships, extremely complex spatial structures and a subtle interplay of colour. His most important and revolutionary work, the Maeste for Siena Cathedral, was never matched during the 14th century, if at all, and his influence lasted well into the 15th century. Maesta with Twenty Angels and Nineteen Saints. Maesta with Twenty Angels and Nineteen Saints.