TRAJAN, Arch of, an arch constructed by the Romans at Benevento, Italy. It was erected in 114 A. D. to commemorate the completion of a new road from Rome to Brundisium. The material used is white marble. It is 50 feet in height and has an archway 27 feet high. Trajan's triumphs over the Dacians are represented by elaborate reliefs. This arch is in a good state of preservation.