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In 1867, McGilvary moved to Chiang Mai in northern Thailand, where he pioneered Christian work in the north. First Church in Chiang Mai was founded in 1868. The work in Northern Thailand was called the Laos Mission, and the work in Bangkok, Central Thailand, and Southern Thailand was called the Siam Mission. In 1913, the Laos Mission counted approximately 6000 Thai Christians converts in the North, and the Siam Mission counted approximately 600 Thai Christian converts in their jurisdiction.