Under the Ming, the Forbidden City's Gate of Divine Prowess was called the Xuanwu Gate.
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history
玄武, the Black Tortoise, guards the north, so a palace's north gate was often named after it. The Tang gate gave its name to the 玄武门之变 of 626. The Beijing gate lost the name because the Kangxi emperor's personal name, 玄烨, made 玄 taboo.