Umar ibn al-Khattab [a] (Arabic: عُمَر بْن ٱلْخَطَّاب, romanized: ʿUmar ibn al-Khaṭṭāb; c. 582/583 – 644), also spelled Omar, was the second Rashidun caliph, ruling from August 634, when he succeeded Abu Bakr (r. 632–634) as the second caliph, until his assassination in 644. More @Wikipedia
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