I was reading something and I came across this: "The first epoch of 450 years began in 638 when Caliph Umar accepted the surrender of Jerusalem and was surprised when informed that there were no Jews in the city. Over the previous century the Byzantine emperors, in collusion with the local Christians, had forced the Jews to convert. Those who did not were expelled from Jerusalem and banned from praying at the sacred Temple Wall. Jews often came surreptitiously to the neighbouring hills overlooking the sacred site to pray and gaze at the Temple wall. To rectify this injustice, Hazrat Umar en