There was a calligrapher in the Northern Song Dynasty. Because his family was poor and had no money to buy pens, ink, paper and inkstone, he wrote on the sand with a reed pole. Who is he?

When Ouyang Xiu was a child, his family was poor and he had no money to study. His mother taught him to write on the ground with a reed pole. If you are a little older, if you have no books to read at home, you will borrow books from your fellow travelers' homes and stay up all night, forgetting to eat and sleep. The poems and essays he wrote since childhood have reached the level of an adult since he wrote them.