Why is Baishui called the land of four saints?

Cang Xie, Du Kang, Xiang Lei and Cai Lun were named after ancient Baishui saints.

Baishui has been called "the hometown of four saints" since ancient times. According to legend, Cang Xie, Du Kang, Leixianghe, who created Chinese characters, and Cai Lun, who was the first paper in the world, were all ancient sages of Baishui. They have made amazing achievements in this hot land of whitewater, and they have forged their own destiny in whitewater.