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  Muhammad died and people began to wonder, who would lead the Muslim faith.
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  Abu Bakr became caliph and he set to reuniting Islam among the tribes, keeping Islam together
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  Caliph Abu Bakr declared jihad or holy war, on Byzantine Empire, which peopled mostly by Greek- speaking christians.
 By 750 Arabs and their conquere
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  Fought between Muslim Arab forces and Eastern Roman empire, battle lasted for 6 days ended in August 636, ended Byzantine rule in Syria.
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  Caliph Umar order full invasion of Sassanid empire in 642, Sassanid ended in 651.
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  under the Umayyad Dynasty from 651–750, only about 10 percent of non-Muslims converted to Islam.
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  Caliph Ali was assassinated.
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  Tariqibn Ziyad known as one of most important commanders in Iberian history, Led Islamic conquest of Visigoth Spain{711-718].
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  aka Battle of Poitiers between cities of Poitiers and Tours in north central France, Marked the end of Islam’s Northward expansion of Europe, Charles Martel seen as champion of Christianity {preserving it as religion of Europe}.
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  By 750 Arabs and their conquered territories stretched from Atlantic ocean to India.