According to chroniclers such as Eusebius, the Battle of the Milvian Bridge between the Roman Emperors Constantine I and Maxentius on October 28, 312 marked the beginning of Contantine's conversion to Christianity. Eusebius recounted that Constantine and his soldiers had a vision that God promised victory if they daubed the labarum (the chi-rho symbol) on their standards. Constantine won the battle and started on the path that led him to end the Tetrarchy and become the sole ruler of the Roman Empire. The Arch of Constantine, erected in Rome in 315 in celebration of the victory, attributed Constantine's success to divine intervention, but whether it was specifically at the hands of the Christian God was left ambiguous in an effort to please both pagan and Christian readers.