The year title of an ancient emperor was usually suggested by two historians or politicians when making new dynasty plans or political decisions. These year titles were usually meaningful names used to commemorate an outstanding person or some important event, or to commemorate the emperor himself or his ancestors. For example, the Han Dynasty in China was named after Liu Qi, the Emperor Jing of the Han Dynasty. The name "Han" came from the founder of the Han Dynasty, Liu Bang. Emperor Jing of the Han Dynasty also established some other year titles, such as "Hanwu" for Emperor Wu of the Han Dynasty,"Hanxuan" for Emperor Xuan of the Han Dynasty, and "Heping" for Emperor He of the Han Dynasty. Some emperors 'titles were also based on their political or military achievements during their reign. For example, the founding emperor of the Tang Dynasty, Tang Taizong, Li Shimin, had the title of Zhenguan. The name came from his achievements during his reign, which achieved political, economic, cultural, and military unification. The year title of an ancient emperor was usually suggested by two historians or politicians when making a new dynasty plan or political decision, or it was a memorial to the emperor himself or his ancestors, or it was based on the political or military achievements made during his reign.