Assertion: caliph's son | /r/HasProperty | r. 680–683
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Source sentences:
text: (r. 661–680), the founder of this dynasty, based his rule on careful cultivation and manipulation of ties with tribal notables (ashraf), and it was through such ties that he was able not just to govern but also to have his son, Yazid I (r. 680–683), recognized as his heir.