Assertion: caliphate's governor | /r/HasProperty | muawiyah's elder brother
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Source sentences:
text: Muawiyah I was appointed Governor of Syria by Umar in 639, after the previous Governor, Muawiyah's elder brother Yazid ibn Abi Sufyan, died in a plague along with Abu Ubaidah ibn al-Jarrah (the Governor before him) and 25,000 other people.