It is perhaps on account of this intermediate flavour that the literature of Persia - for instance the adaptations of Omar Khayyam - is more appreciated in Europe than that of other Oriental nations.
On the Arab invasion this work was in great danger of perishing at the hands of the iconclastic caliph Omar and his generals, but it was fortunately preserved; and we find it in the 2nd century of the Hegira being paraphrased in Arabic by Abdallah ibn el Mokaffa, a learned Persian who had embraced Islam.
- Within fifteen years of the Hegira Jerusalem fell before the arms of Omar (637), and it continued to remain in the hands of Mahommedan rulers till the end of the First Crusade.
The Acciajuoli dynasty lasted till June 1458, when the Acropolis after a stubborn resistance was taken by the Turks under Omar, the general of the sultan Mahommed II., who had occupied the lower city in 1456.
The Kubbet-esSakhra, or Dome of the Rock, at Jerusalem, is only a shrine erected over the sacred rock, so that the title often ascribed to it as "the mosque of Omar" is misleading.