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After the death of Mohammed, his father-in-law, Abu Bakr became the caliph of the Islamid empire
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The first four Caliphs were known as the Rightly Guided Caliphs. Three of the four were murdered
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The Umayyads made Islam even bigger. Islamic culture was found in all the places they conquered. Under Caliph Mu'awiya, Damascus became the capital in 661.
From 690, Arabic was the official language of the government.The first great mosque, The Dome of Rocks, was built in the 690s -
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After a civil war, the Abbasids came to power. Abu'l Abbas became the first Abbasid Caliph.Arabic language became the offical language across the Islamic empire. Iraq was made capital. In 763, Bagdad was founded as the new capital. Science of Astronomy was brought to Bagdad in 771. Stories such as the Arabian Nights began to be told in about 786
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Waves of invasions from Turkish tribes changed the Islamic Empire. in 1091, the Seldjuks made Bagdad their capital city. In 1096, Pope Urban began the first Crusade. By 1118, the Seldjuk empire had been broken into small states.
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