Chin dynasty

You may be looking for Qin dynasty.

The Chin dynasty was a Chinese dynasty which ruled the Chin Empire until the 13th century. A key city in the empire was the city of Chung-Tu

In circa 1210, the Chin Empire was invade by the Mongol Empire, hence providing them with gunpowder, which was considered one of the most powerful weapons of the time. In 1240 near Kiev, the First Doctor met Ling, a man from the former Chin Empire and who now accompanied the Mongols on their invasion of Europe. (PROSE: Bunker Soldiers)