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In page Samarkand:

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Christianity was introduced to Samarkand when it was part of Sogdiana, long before the penetration of Islam into Central Asia. The city then became one of the centers of Nestorianism in Central Asia.[1] The majority of the population were then Zoroastrians, but since Samarkand was the crossroads of trade routes among China, Persia, and Europe, it was religiously tolerant. Under the Umayyad Caliphate, Zoroastrians and Nestorians were persecuted by the Arab conquerors;[citation needed] the survivors fled to other places or converted to Islam. Several Nestorian temples were built in Samarkand, but they have not survived. Their remains were found by archeologists at the ancient site of Afrasiyab and on the outskirts of Samarkand.