Арнольфо ди Камбио
On the southern walls is the ambon, sculpted by Fra Guglielmo da Pisa, but also thought to have been a collaboration completed along with Arnolfo di Cambio. Executed in 1270, it was initially located in the Romanesque presbytery, and moved to its present position in 1778. The high-relief sculptures, in Apuan marble are engraved with "Realizzato nel 1270," originally had a polychrome glass background, now mostly lost. At the steps of the columns are sculptures of lions.