In the same complex as Basilica di San Vitale, the small but equally incandescent Mausoleo di Galla Placidia was constructed for Galla Placidia, the half-sister of Emperor Honorius, who initiated construction of many of Ravenna's grandest buildings. The mosaics here are the oldest in Ravenna, probably dating from around AD 430.
Note that visits are often restricted to five minutes.