Apollo in Circo: captured barbarians (detail)
The dress of the barbarians, who have been bound and are being displayed on a ferculum (a litter) as part of a triumphal parade, indicates that they are captives from the north. This leads some scholars to see this depiction as reference to the first day of the future emperor Augustus's great triple triumph of 29 BCE (a celebration of victory over the Dalmations, Pannonians and others from Gaul and Germany). In the center a fine representation of a military trophy with four round shields, barbarian dress including a tunic and a mantle, and an odd-looking, wiglike hairpiece, all arranged on the trunk of a tree.
Found in 1937; Capitoline Museums (Montemartini) inv. 2776.
Compare to the trophy depicted on the back of the cuirass of the statue of Augustus from Prima Porta in the Vatican Museums: