A great place to find photos of late antique art, especially ivories such as the one below, is Antiquité Tardive on Flickr. The photos are licensed through Creative Commons.
Photo: Antiquité Tardive.
This is a detail from an ivory diptych in the Musée National du Moyen-Âge (Cluny). It shows the consul Areobindus presiding over the games in Constantinople. Like the inscriptions from the Colosseum that I discussed the other day, the diptych can be dated by consular date. Flavius Areobindus Dagalaiphus Areobindus was consul in AD 506.