Assertion: caliph's son | /r/HasProperty | r. 786–809
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Source sentences:
text: The empire was also shaken by a destructive civil war between two sons of Harun al-Rashid (r. 786–809), eventuating in the murder of the incumbent caliph, al-Amin (r. 809–813), and the succession of his brother and the governor of Khurasan, al-Ma˒mun (r. 813–833).