I think the most representative mediocrity in history is Daoguang. At the beginning of Daoguang's accession to the throne, China was facing the most serious internal and external troubles. Although he is arbitrary and hands-on, he is known for his frugality. However, the internal affairs such as official management, river engineering, water transport and smoking ban have not improved, and they are diligent in seeking treatment and rarely do anything. At the critical moment of the historical turning point, "keeping the status quo and not knowing what will change" lost the last chance for our country to avoid modern humiliation. During his tenure, his mediocrity led to the failure of the Opium War, and he signed the treaty of nanking, the first unequal treaty in China's modern history, with Britain. Since then, China has fallen into the abyss of colony and semi-colony.