Thomas Ashby, 1911 Encyclopædia Britannica, Volume 24… (1911)
“ Two magnificent marble ambones, the larger dating from 1175, a large 11th-century altar frontal in the south aisle, having scenes from the Bible carved on thirty ivory tablets, with 13th-century mosaics in the apse, given by Giovanni da Procida, the promoter of the Sicilian Vespers, and the tomb of Pope Gregory VII., and that of Queen Margaret of Durazzo, mother of King Ladislaus, erected in 1412, deserve to be mentioned. In the crypt is a bronze statue of St Matthew. The cathedral possesses a fine Exultet roll. ”
