During imperial China (221 BCE–1911 CE), a wide variety of noble titles were granted. Some of these were hereditary; an overlapping subset were honorary.
At the beginning of imperial China, the administration of territory was growing out of the older fengjian system, and the central government asserting more control over the old aristocracy. The emperor, as sovereign, held the power to grant noble titles and to enfeoff vassals.
Enfeoffing members of overthrown dynasties It was a custom in China for the new dynasty to ennoble and enfeoff a member of the dynasty which they overthrew with a title of nobility and a fief of land so that they could offer sacrifices to their ancestors, in addition to members of other preceding dynasties. This practice was referred to as "the two crownings and three respects."
When the Xia dynasty was overthrown by the Shang dynasty, Xia descendants were given a title and fiefs by the Shang King in Qi and Zeng. (The kings of Yue claimed to be a cadet branch of the Xia).
When the Shang dynasty was overthrown by the Zhou dynasty, the Zhou King granted a Shang descendant the title of Duke and fief in the Song, and the Zhou King also reconfirmed the titles of the Xia descendants in the Qi and Zeng. Confucius was a descendant of the Shang Kings via the Song Dukes and Confucius' descendants held the hereditary title Duke Yansheng right to 1935.
When the Yue King Wujiang (無彊) was conquered by Chu, the Chu King enfeoffed Wujiang as Marquis of Ouyang District.
When the Han dynasty Emperor Xian of Han was dethroned by the Cao Wei Emperor Cao Pi, Cao granted Emperor Xian the title Duke of Shanyang (山陽公). His grandson Liu Kang (劉康) inherited his dukedom, which lasted for 75 more years and two more dukes, Liu Jin (劉瑾) and Liu Qiu (劉秋), until the line was exterminated by invading Xiongnu tribes in about 309, during the Jin dynasty.
The Emperors of Shu Han came from a cadet branch of the Han dynasty. When the Shu Han Emperor Liu Shan was defeated by Cao Wei, the Cao Wei enfeoffed Liu Shan as the "Duke of Anle" (安樂公; literally meaning "duke of peace and comfort") while his sons and grandsons became marquises. Liu Shan died in 271 in Luoyang, and was given the posthumous name "Duke Si of Anle" (安樂思公; literally "the deep-thinking duke of Anle"). His dukedom lasted several generations during Wei's successor state, the Jin dynasty, before being extinguished in the turmoils caused by the Wu Hu.
When the Eastern Wu was defeated by the Jin dynasty, the Jin Emperor granted the Eastern Wu Emperor Sun Hao the title of "Marquis of Guiming". Sun Hao's sons were made junior officials in the Jin government.
When the Jin dynasty Emperor Gong of Jin was overthrown by the Liu Song Emperor Wu of Liu Song, Emperor Wu enfeoffed Emperor Gong as Prince of Lingling. However Emperor Gong was ordered killed. Sima Guang was a Jin Imperial family descendant who became a chancellor in the Song dynasty hundreds of years after the fall of the Jin.
When the Liu Song Emperor Shun of Liu Song was overthrown by the Southern Qi Emperor Gao of Southern Qi, Emperor Gao enfeoffed Emperor Shun as Prince of Ruyin. However Emperor Shun was killed.
When the Southern Qi Emperor He of Southern Qi was overthrown by the Liang dynasty Emperor Wu of Liang, Emperor Wu enfeoffed Emperor He as Prince of Baling. However Emperor He was killed.
When the Liang dynasty Emperor Jing of Liang was overthrown by the Chen dynasty Emperor Wu of Chen, Emperor Wu enfeoffed Emperor Jing as Prince of Jiangyin. However Emperor Jing was killed.
The Xianbei Tuoba royal family of Northern Wei started to arrange for Han Chinese elites to marry daughters of the royal family in the 480s. Some Han Chinese exiled royalty fled from southern China and defected to the Xianbei. Several daughters of the Xianbei Emperor Xiaowen of Northern Wei were married to Han Chinese elites, the Han Chinese Liu Song royal Liu Hui 刘辉, married Princess Lanling 蘭陵公主 of the Northern Wei,. Princess Huayang 華陽公主 to Sima Fei 司馬朏, a descendant of Jin dynasty (266–420) royalty, Princess Jinan 濟南公主 to Lu Daoqian 盧道虔, Princess Nanyang 南阳长公主 to Xiao Baoyin 萧宝夤, a member of Southern Qi royalty. Emperor Xiaozhuang of Northern Wei's sister the Shouyang Princess was wedded to The Liang dynasty ruler Emperor Wu of Liang's son Xiao Zong 蕭綜.
When the Eastern Jin dynasty ended Northern Wei received the Jin prince Sima Chuzhi 司馬楚之 as a refugee. A Northern Wei Princess married Sima Chuzhi, giving birth to Sima Jinlong. Northern Liang King Juqu Mujian's daughter married Sima Jinlong.
When the Northern Qi Emperor Gao Heng was overthrown by Northern Zhou Emperor Wu of Northern Zhou, Emperor Wu enfeoffed Emperor Gao Heng as Duke of Wen. However Gao Heng was killed.
When the Northern Zhou Emperor Jing of Northern Zhou was overthrown by the Sui dynasty Emperor Wen of Sui, Emperor Wen enfeoffed Emperor Jing as Duke of Jie. However, he had all of close male clansmen of the duke—all grandsons of Emperor Jing's great-grandfather Yuwen Tai—put to death, as well as Emperor Jing's brothers Yuwen Kan (宇文衎) the Duke of Lai and Yuwen Shu (宇文術) the Duke of Yan. About three months later, Emperor Wen had the Duke of Jie secretly assassinated as well, but pretended to be shocked and declared a mourning period, and then buried him with honors due an emperor. The dukedom was passed to a distant relative, Yuwen Luo (宇文洛).
When the Western Liang (Southern and Northern Dynasties) (西梁) Emperor Jing of Western Liang was overthrown by the Sui dynasty Emperor Wen of Sui, Emperor Wen enfeoffed Emperor Jing as Duke of Ju (莒公) and then as Duke of Liang (梁公). His nephew Xiao Ju (蕭鉅) inherited the title of Duke of Liang.
When the Chen dynasty Emperor Chen Shubao was overthrown by the Sui dynasty Emperor Wen of Sui, Emperor Wen enfeoffed Chen Shubao as Duke Yang of Changcheng (長城煬公).
The Tang dynasty Emperors claimed descent from the Dukes of Western Liang (Sixteen Kingdoms) (西涼) and posthumously gave them Imperial titles.
When the Tang dynasty Emperor Ai of Tang was overthrown by the Later Liang Emperor Zhu Wen, Zhu Wen enfeoffed Emperor Ai as Prince of Jiyin. However Emperor Ai was killed.
There were Dukedoms for the offspring of the royal families of the Zhou dynasty, Sui dynasty, and Tang dynasty in the Later Jin (Five Dynasties).
When the Wuyue King Qian Chu surrendered to the Song dynasty the Song Emperor Taizong of Song raised the prefecture of Yangzhou to the nominal state of Huaihai, and installed Qian Chu as King of Huaihai. In 984, Qian Chu was made King of Hannan (a smaller nominal feoff) instead, and in 987 reduced again to King of Hanyang, with the right to take up residence in Hanyang, but then immediately additionally created Prince of Xu, with an enlarged fief. In 988, Qian Chu lost his title as king and was made Prince of Deng instead, with a larger nominal fief and actual income.
When the Jin dynasty (1115–1234) defeated the Liao dynasty and Northern Song dynasty Emperor Tianzuo of Liao and Emperor Qinzong of Song were first enfeoffed with derogatory titles by the Jin, with Emperor Tianzuo becoming the Prince of Haibin 海滨王 ("Seashore Prince") and Emperor Qinzong becoming the Marquess of Chonghun (重昏, "Doubly muddled"); his father received a similarly derogatary-sounding title. In 1141, as the Jin relations with the Southern Song were about to normalized, Qinzong's captors granted him a neutrally-sounding title of the Duke (公, gong) of Tianshui Jun, after a commandery in the upper reaches of the Wei River (now in Gansu), while his father (who had died in 1135) was posthumously styled the Prince of Tianshui Jun; a few months later he started receiving a stipend due to his rank.pp. 233–234. Herbert Franke, Denis Twitchett. Alien Regimes and Border States, 907–1368 (Cambridge History of China, vol. 6). Cambridge University Press, 1994. . Liao royal family members who stayed in the Jin state like Yelu Lu and his son Yelü Chucai served the Jin and then the Yuan dynasty as officials. Other members of the Khitan Liao royal family like Yelü Dashi and Song Imperial family like Emperor Gaozong of Song both survived to rule the Kara-Khitan Khanate and Southern Song dynasty respectively.
When the Kingdom of Dali was conquered by the Yuan dynasty, King Duan Xingzhi of Dali was then enfeoffed as Maharaja by the Yuan Emperor Kublai Khan. The Southern Song dynasty Emperor Gong of Song was enfeoffed as the Duke of Ying (瀛國公) by Kublai Khan, however, the Emperor Yingzong of Yuan ordered him to commit suicide. The Song Prince Zhao Yurui was enfeoffed with the title Duke of Pingyuan Canton (平原郡公) by Emperor Kublai Khan. Other Song Imperial family members like Zhao Mengfu and Zhao Yong were left alive by the Yuan. Zhao Yiguang was a Song Imperial family descendant who was a writer during the Ming dynasty.
When the Ming dynasty fell and the Qing dynasty took over, the Qing Emperors granted a Ming descendant the title Marquis of Extended Grace and gave him a stipend to perform sacrifices to his ancestors, the Ming Emperors at the Ming Imperial Tombs. The Qing granted Zheng Keshuang of the Kingdom of Tungning the title of "Duke of Haicheng" (海澄公) after he surrendered to the Qing.
When the Northern Yuan Chahar Borjigin Mongol Khan Ejei Khan surrendered to the Qing, he was given the title of Prince of the first rank (Qin Wang, 親王), a title he held until his death in 1661, and inherited by his younger brother Abunai (阿布奈). Abunai openly showed his discontent toward the Manchu and he was put under house arrest in Shenyang by the Kangxi Emperor in 1669 and his imperial title / rank was given to his son Borni (布尔尼) in September of that same year. Borni (布尔尼) was careful to not show any sign of disrespecting the Qing dynasty, but finally in 1675, he suddenly rebelled along with his younger brother Lubuzung (罗布藏), capitalizing on the Revolt of the Three Feudatories. However, they had made a serious miscalculation in wrongfully believing that other Mongols would join them, when in reality only three thousand Chahar (Mongols) joined the rebellion. It only took a single decisive battle on April 20, 1675, to defeat Abunai (阿布奈) and his followers, who were all killed subsequently in their retreat. The Qing dynasty's punishment of the rebellion was very harsh: all royal males of Chahar (Mongols) were executed, including infants born to Qing / Manchu princesses, and all royal females of Chahar (Mongols) were sold to slavery except these Qing / Manchu princesses.
The Republic of China allowed the last Qing Emperor to stay in the Forbidden City and keep his title, treating him as a foreign monarch until 1924. The descendants of Confucius were maintained in the title of Duke Yansheng until 1935 when the title was changed to Sacrificial Official to Confucius (大成至聖先師奉祀官), which remains as a position to this day, currently held by Kung Tsui-chang.
Historical examples
Qin and Han dynasty
Prior to the Qin dynasty, Wang (sovereign) was the title for the ruler of whole China. Under him were the vassals or Zhuhou (諸侯), who held territories granted by a succession of Zhou dynasty kings. They had the duty to support the Zhou king during an emergency and were ranked according to the Five Orders of Nobility. In the Spring and Autumn period, the Zhou kings had lost most of their powers, and the most powerful vassals became the de facto ruler of China. Finally, in the Warring States period, most vassals declared themselves Wang or kings, and regarded themselves as equal to the Zhou king.