Chin dynasty
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- You may be looking for Qin dynasty.
According to the First Doctor, the Chin dynasty had provided the Mongol Empire with gunpowder, which was considered one of the most powerful weapons of the time. This occurred sometime between the empire's foundation by Genghis Khan (born 1167) and 1240, when the Doctor relayed this fact to Steven Taylor. (PROSE: Bunker Soldiers)