In 66 CE the Jewish population rebelled against the Roman Empire. Four years later, on 4 August 70 CE (the 9th Day of Av and possibly the day on which Tisha B'Av was observed) or 30 August 70 CE, Roman legions under Titus retook and destroyed much of Jerusalem and the Second Temple. The Arch of Titus, in Rome and built to commemorate Titus's victory in Judea, depicts a Roman victory procession with soldiers carrying spoils from the Temple, including the Menorah. According to an inscription on the Colosseum, Emperor Vespasian built the Colosseum with war spoils in 79 CE – possibly from the spoils of the Second Temple.