Umar ibn al-Khattab (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. Umar was a senior companion and father-in-law of the Islamic prophet Muhammad. Umar initially opposed Muhammad, who was his distant Qurayshite kinsman and later became his son-in-law. However, after his conversion to Islam in 616, Umar became the first Muslim to openly pray at the Kaaba.
https://en.wikipedia.org/wiki/Umar
Umar ibn al-Khattab (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. Umar was a senior companion and father-in-law of the Islamic prophet Muhammad. Umar initially opposed Muhammad, who was his distant Qurayshite kinsman and later became his son-in-law. However, after his conversion to Islam in 616, Umar became the first Muslim to openly pray at the Kaaba.
