From wikipedia:
Cenni di Pepo (Giovanni) Cimabue (c. 1240 — c. 1302) also known as Bencivieni di Pepo or in modern Italian, Benvenuto di Giuseppe, was an Italian painter and creator of mosaics from Florence. He is also well known for his student Giotto, considered the first great artist of the Italian Renaissance. Cimabue is generally regarded as the last great painter working in the Byzantine tradition.The art of this period comprised scenes and forms that appeared relatively flat and highly stylized. Cimabue was a pioneer in the move towards naturalism, as his figures were depicted with rather more life-like proportions and shading.