1. Spread of Early Islam
... during the Orthodox Caliphate, the first and longest running after Muhammad's death, that the most significant spreading of Islam occurred, mainly due to the strength and numbers of their military. Omar was the leader of the Caliphate from 634-644 CE, and was one of the most significant leaders in Islamic history (http://campus.northpark.edu/history/WebChron/Islam/). He led ... significant, because it was the annex of the 400-year Persian Empire, a huge feat. When the Muslims took Alexandria, they drove the Byzantines out of Egypt, their long-time dwelling. Omar's key strengths were his...
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