1800 nearly one-third of the Crimean Tatar population, about 100,000 people, had emigrated to the Ottoman Empire with another 10,000 leaving in the wake of the Russo-Turkish war of 1806–12. They were replaced by Russian settlers and other Eastern Christians: Greeks, Armenians, Bulgarians, many of them refugees from the Ottoman Empire who wanted the protection of a Christian state. The exodus of the Crimean Tatars was the start of a gradual retreat of the Muslims from Europe. It was part of a long history of demographic exchange and ethnic conflict between the Ottoman and Orthodox spheres which
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