The philosopher Cheng Ben in the Spring and Autumn Period wrote Zi Huazi, which was handed down from generation to generation. In the Han Dynasty, Yin Xun was known as one of the eight cares, and was called Yin Yuanbo, a British vassal in the world. Flora of the South written by Han Ji, a botanist in Jin Dynasty, is the earliest flora in the world. Du Fu, a poet sage in Tang Dynasty, was born in Gongyi. Du Fu, a poet in the Tang Dynasty, has a collection of poems handed down from generation to generation.