<P> The other scenes on the ceiling depict different stories in horizontal tiers of mosaic: (starting at the top) Choirs of Dominations, Powers, Archangels, Angels, Principalities, Virtues and Thrones (counter clockwise); stories from the Book of Genesis; stories of Joseph; stories of Mary and the Christ and finally in the lower tier: stories of Saint John the Baptist . </P> <P> In the drum under the ceiling are many heads of prophets, attributed to Gaddo Gaddi, a friend of Cimabue . </P>

Who won the competition for the baptistery doors in florence