“The images on Trajan’s Column are not only notable for their bold artistry, but also constitute an important historical record. This section of the frieze vividly illustrates the painstaking accuracy of the depictions. The lower register shows...
"The triumphal Arch of Constantine was erected next to the Colosseum in AD 315 to commemorate Constantine's victory over Maxentius three years earlier." (p.149); "One of four [Antonine] reliefs from a monument erected by the emperor...