Of the imperial regalia of the Roman Emperors, previous to the Byzantine era, little remains. The best-known examples, and those with the strongest claim to authenticity, are a sceptre, some fittings for Roman standards, and other small items, all from a cache buried on the Palatine Hill c. the 3rd or 4th century AD, and discovered in 2006. The objects were made of fine bronze, glass, and semi-precious stone. These items were almost certainly intended for personal use by the emperor and his retinue, making them unique surviving examples of their type. The archaeologists who excavated the find have suggested that the items might have belonged to the emperor Maxentius, and may have been concealed by some unknown loyalist followers after his final defeat, and subsequent death. Beyond this, the regalia of the ancient Roman emperors exists primarily in artistic depictions from their time-period.