The other scenes on the lower zones of the five eastern sections of the dome depict different stories in horizontal tiers of mosaic: (starting at the top) 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, patron saint of the church. A total of sixty pictures originated in the last decade of the thirteenth century. The key artists employed were Corso di Buono and Cimabue. It is the most important narrative cycle of Florentine art before Giotto.