Duke: The Tang Dynasty was divided into duke, county magistrate and county magistrate. Qi Huangong takes the country as the title, such as (Cheng) conferring the title of Duke of Lu (in the Spring and Autumn Period, Lu was a vassal state of Shandong), and county magistrate and county magistrate take the county/county name as the title. For example, Duke Xiuwu sometimes adds the word "founding" before the title. The Song and Ming Dynasties unified the seal of lord protector. Subordinates are commensurate with their titles.
Marquis: The Qin and Han Dynasties were divided into Guan Neihou and Hou Ting. The title of Wei Qing's Changping Hou is Guan Neihou, and Guan Yu in The Romance of the Three Kingdoms is Hou Ting. After the Sui and Tang Dynasties, there were county kings and township kings, and administrative divisions were also used as titles, and the lower levels were commensurate with titles.
Earl: County and township are also used as appellations, sometimes casually, such as Ping Xibo, the great traitor in Wu Sangui. The same is the title.
The viscount/baron also takes the county/township as the fief/title, and so does the title.
Note: Except for titles, all other titles are hereditary, relegated hereditary and non-hereditary. Heredity means that the eldest son (Prince) inherits his father's original title, and Lao Zi is lord protector. After his death, his son succeeded and continued to serve as lord protector. Hereditary is that Lao Zi is lord protector, and when he dies, his son inherits him, and he is reduced to a chief/chief. Non-hereditary means that I am from the county. When he dies, he has no title, and his son is nothing.