The mosaic marble pavement was begun in 1209. The geometric patterns in the floor are complex. Some show us oriental zodiac motifs, such as the slab of the astrologer Strozzo Strozzi. There was an octagonal font, its base still clearly visible in the middle of the floor. This font, which once stood in the church of Santa Reparata, was installed here in 1128. Dante is said to have broken one of the lower basins while rescuing a child from drowning. The font was removed in 1571 on orders from the grand duke Francesco I de' Medici. The present, and much smaller, octagonal font stands near the south entrance. It was installed in 1658 but is probably much older. The reliefs are attributed to Andrea Pisano or his school.