Caliph Omar became Caliph in 634 A.D. upon the death of Caliph Abu Bakr, only two years after Mohammed's death and sixteen years before the Koran was completed. He captured Jerusalem and had the mosque built - the Mosque of Omar or Dome of the Rock.

Mohammed's dad Abd Allah died before he was born; his mother Aminah died when he was six; his grand-dad Abd Al-Muttalib when he was eight. He was then looked after by his uncle.

Mohammed married Khadija, who was a Roman Catholic, when he was 25 and she was 40. Her cousin was called Waraquah and was also a Roman Catholic Meccan.

The most famous of Mohammed's four daughters was Fatima, after whom the Moslem conquerors named the place in Portugal where, in 1917, the young girl had three visions: the third of which the Vatican has never revealed, because it was from God and was against them and their evil ways.

Mohammed was visited by Gabriel in a cave on Mt. Hira in 610 A.D. at age 40.

Mohammed said, "Satan touches every son of Adam the day his mother beareth him (Revelation 12:4), save only Mary and her son (Jesus)."

Mohammed fled to Medina in 622 A.D. after Khadija's death.

He marched on Mecca in 630 A.D. two years before he died, and four years before Omar became Caliph.

The Koran was compiled in 650 A.D.