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Legend from the apocryphal Gospel of Thomas and other ancient documents suggests that Saint Thomas the Apostle preached in Bactria, which is today northern Afghanistan.
The Nestorians planted Christianity in the area, and there have been nine bishops and dioceses in the region, including Herat (424-1310), Farah (544-1057), Kandahar, and Balkh. This early establishment of Christianity was overcome by Muslim invasions in the 7th century