Fragment of marble mosaic floor portraying the Agnus Dei. Probably dating back to the first half of the 15th century, with 19th century inserts (frame and clipeus). The mosaic, in different colored marbles, is composed on a square slab, and was formerly part of a flooring. The centerpiece of the mosaic is the Agnus Dei, symbol of the Cathedral works and of Wool Guild of Florence, the powerful corporation that financed projects for the Cathedral. The lamb doesn’t just symbolize the wool and the Guild that made cloth from it; it also represents Christ “the sacrificial lamb of God”, as he is described in the desert by John the Baptist and as he appears in a vision to John the Evangelist described in the Apocalypse. In the New Testament Christ is seen as the universal fulfillment of the Jewish tradition, whose Passover sees a lamb sacrificed to cleanse the population of its sins. According to Christians he is the “Lamb of God, who takes away the sins of the world”.