Assertion: caliph's power | /r/HasProperty | significant
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text: During the first half of this model before the Mongol attack in 656/1258, the Baghdad-based caliph’s symbolic power was significant, but even afterward in the Mamluk period, when the Abbasid caliph, now in Cairo, lost all power, in distant Muslim lands such as Delhi and Timbuktu, his letter of investiture was crucial to marking the difference between mere usurpation of power and legitimacy and belonging to the Muslim body politic.