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In 730 Emperor Leo III banned the use of icons or religious images used by eastern christians. These icons were thought to represent idols, riots, and rebellions. The pope even got involved ordering the excommunication of the Byzantine Emperor.
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In 1054 the Pope and the patriarch excommunicated each other. This started a dispute over religious doctrine. Shortly afterward, Christianity split between the Roman Catholic Church in the West and the Orthodox Church in the East.
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The Seljuks face the Mongols in 1258. Genghis khan's grandson led his troops into baghdad. He killed entire populations. They also destroyed their defensive walls and took the city.
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