What Happened in 644 AD
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- Nov 3 Umar ibn al-Khattab, second Muslim caliph, is killed in Medina by Lu'lu, an enslaved Persian captive
- Dec 14 Uthman ibn Affan, companion of Muhammad, appointed 3rd Caliph of Islam
- Nov 7 Umar ibn al-Khattāb, Second caliph of Islam, dies of injuries after assassination attempt 4 days earlier
- Dec 8 Omar I, 2nd Caliph of Islam (634-44), oversaw conquest of Persia and Egypt), murdered at 59 or 60
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List of Years