Although the Qur'an does not mention the name Jerusalem, the hadith assert that it was from Jerusalem that Muhammad ascended to heaven in the Night Journey, or Isra and Miraj. The city was one of the Arab Caliphate's first conquests in 638 CE; according to Arab historians of the time, the Rashidun Caliph Umar ibn al-Khattab personally went to the city to receive its submission, cleaning out and praying at the Temple Mount in the process. Sixty years later the Dome of the Rock was built, a structure enshrining a stone from which Muhammad is said to have ascended to heaven during the Isra. (The octagonal and gold-sheeted Dome is not the Al-Aqsa Mosque to the south, the latest version of which was built more than three centuries later). Umar ibn al-Khattab also allowed the Jews back into the city and freedom to live and worship after four hundred years.