In Journey To The West
In the classic novel Journey to the West, Xuánwǔ was a king of the north who had two generals serving under him, a "Tortoise General" and a "Snake General". This king had a temple at Wudang Mountains in Hubei, thus there is a Tortoise Mountain and a Snake Mountain on the opposite sides of a river in Wuhan, the capital of Hubei.
Read more about this topic: Xuan Wu (god)