Arnolfo di Cambio
Among the artifacts remaining from the 13th century edifice are a mural painting depicting the "Last Judgment" (1289–93) by Pietro Cavallini in the choir of the nuns, and the ciborium (1293) in the presbytery by Arnolfo di Cambio. The Gothic ciborium is surrounded by four marble columns white and black, decorated with statuettes of angels, saints, prophets, and evangelists.