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The Caliph builds a new capital city known as Baghdad.

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A mathematician and scientist  called al-Khwarizmi is born. He is also know as the "Father of Algebra."

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Al-Azhar University in Cairo, Egypt is founded.

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Ibn Sina completes his encyclopedia of a medicine called The Canon Of Medicine.

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A famous scientist called Omar Khayyam is born.

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The Christian Armies recapture Jerusalem during The First Crusade.

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Saladin retakes the city of Jerusalem.

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The Mongol army sacks the city of Baghdad destroying much of the city and then killing the Caliph.