What is the title of the king of Qin?

There was no title in the Qin Dynasty, and the title system was founded in the Han Dynasty.

Year number: the title used by China feudal dynasty to record the year (it can also be used to indicate the year). From "Yuanshou" in 122 BC to "Xuan Tong" in191year BC.

There was no title from the pre-Qin Dynasty to the early Han Dynasty, which was initiated by Emperor Wu of the Han Dynasty after he ascended the throne. The founding year is yuanshou, which is called "yuanshou". In the past, the year numbers were "Jianyuan", "Yuanguang" and "Yuanshuo", and then formed a system. Emperors of past dynasties have to change their titles whenever they encounter major events such as "good fortune from heaven" or internal troubles and foreign invasion. An emperor uses one to a dozen titles. For example, Tang Gaozong has14; Most emperors in Ming and Qing dynasties had a title, so later generations used titles as titles for emperors, such as Emperor Yongle, Emperor Qianlong and Emperor Kangxi.

The title originated from the accession of the new emperor in ancient China. In order to distinguish the last emperor, the new emperor gave a new title according to his own ideas. As the exclusive product of Emperor China in the 5,000-year-old Chinese imperial system, the title of the year has already become history with the present civilized society, but its contribution is indelible and it is the spiritual and cultural heritage in the history of China.