Yan () was a Chinese kingdom that existed from July 237 to September 238 CE in the

Liaodong Peninsula The Liaodong or Liaotung Peninsula ( zh, s=辽东半岛, t=遼東半島, p=Liáodōng Bàndǎo) is a peninsula in southern Liaoning province in Northeast China, and makes up the southwestern coastal half of the Liaodong region. It is located ...

during the

Three Kingdoms The Three Kingdoms of Cao Wei, Shu Han, and Eastern Wu dominated China from AD 220 to 280 following the end of the Han dynasty. This period was preceded by the Eastern Han dynasty and followed by the Jin dynasty (266–420), Western Jin dyna ...

period. Its predecessor was an independent regime ruled by Gongsun Du and his son Gongsun Kang from 190 to 237. Though it only claimed independence in 237, historians such as Wang Zhongshu and Hou Tao consider it to be a de facto independent regime from when Gongsun Du established his rule in Liaodong in 190. Although it existed during the Three Kingdoms period, it is not counted as one of the eponymous three kingdoms:

Cao Wei Wei () was one of the major Dynasties in Chinese history, dynastic states in China during the Three Kingdoms period. The state was established in 220 by Cao Pi based upon the foundations laid by his father Cao Cao during the end of the Han dy ...

Shu Han Han (; 221–263), known in historiography as Shu Han ( ) or Ji Han ( "Junior Han"), or often shortened to Shu ( zh, t=蜀, p=Shǔ; Sichuanese Pinyin: ''Su'' < Middle Chinese: *''źjowk'' < Eastern Han Chinese: *''dźok''), was a Dynasties in ...

, and

Eastern Wu Wu (Chinese language, Chinese: 吳; pinyin: ''Wú''; Middle Chinese *''ŋuo'' < Eastern Han Chinese: ''*ŋuɑ''), known in historiography as Eastern Wu or Sun Wu, was a Dynasties of China, dynastic state of China and one of the three major sta ...

. Nevertheless, writers such as

Kang Youwei Kang Youwei (; Cantonese: ''Hōng Yáuh-wàih''; 19March 185831March 1927) was a political thinker and reformer in China of the late Qing dynasty. His increasing closeness to and influence over the young Guangxu Emperor sparked confli ...

consider it to be a "fourth country".

Predecessors

Gongsun Du

Gongsun Du's father Gongsun Yan (公孫延) lived in Xuantu Commandery where Gongsun Du became minister in 170. Although he was dismissed from his post, he became administrator of

Liaodong Commandery Liaodong Commandery ( zh, 遼東郡) was a commandery in imperial China that existed from the Warring States period to the Northern dynasties. It was located in modern Liaoning, to the east of the Liao River. The commandery was created by the sta ...

in 190 or 189 on the recommendation of

Dong Zhuo Dong Zhuo () (c. 140s – 22 May 192), courtesy name Zhongying, was a Chinese military general, politician, and warlord who lived in the late Eastern Han dynasty. At the end of the reign of the Eastern Han, Dong Zhuo was a general and powerful ...

. Gongsun Du established a monarchial rule and completely controlled Liaodong. He split Liaodong into three commanderies, creating Liaoxi Commandery and Zhongliao Commandery out of Liaodong. Liaodong was adjacent to

Goguryeo Goguryeo (37 BC – 668 AD) (; ; Old Korean: Guryeo) also later known as Goryeo (; ; Middle Korean: 고ᇢ롕〮, ''kwòwlyéy''), was a Korean kingdom which was located on the northern and central parts of the Korea, Korean Peninsula an ...

, whose rulers initially cooperated with Gongsun Du but subsequently frequently quarreled.Gardiner 1972a : 69–70. Gongsun Du repeatedly attacked both Goguryeo and

Wuhuan The Wuhuan (, < Eastern Han Chinese: *''ʔɑ-ɣuɑn'', <

Cao Cao Cao Cao (; ; ; 15 March 220), courtesy name Mengde, was a Chinese statesman, warlord, and poet who rose to power during the end of the Han dynasty (), ultimately taking effective control of the Han central government. He laid the foundation f ...

gave Gongsun Du the titles of "general of military might" and "lord of Yongning Xiang". However, Gongsun Du rejected the latter title, considering himself the king of Liaodong, rather than a mere lord. The title would be given to his younger son Gongsun Gong after Gongsun Du's death. Gongsun Du military activities are largely credited with leading to the Gongsun family's rise.

Gongsun Kang

When Gongsun Du died in 204, his son Gongsun Kang took over, and shortly after exploited a succession feud in Goguryeo. Though the candidate supported by Gongsun Kang was eventually defeated, the victor Sansang of Goguryeo was compelled to move his capital southeast to Hwando (present-day

Ji'an Ji'an ( zh, c=吉安 , p=Jí'ān) is a prefecture-level city situated in the central region of Jiangxi province of the People's Republic of China and bordering Hunan province to the west. It has an area of and as of the 2020 census, had a popu ...

Jilin ) , image_skyline = Changbaishan Tianchi from western rim.jpg , image_alt = , image_caption = View of Heaven Lake , image_map = Jilin in China (+all claims hatched).svg , mapsize = 275px , map_al ...

) on the

Yalu River The Yalu River () or Amnok River () is a river on the border between China and North Korea. Together with the Tumen River to its east, and a small portion of Paektu Mountain, the Yalu forms the border between China and North Korea. Its valle ...

, which offered better protection. Gongsun Kang moved in and restored order to the

Lelang Commandery The Lelang Commandery was a Commandery (China), commandery of the Han dynasty established after it had conquered Wiman Joseon in 108 BC and lasted until Goguryeo conquered it in 313. The Lelang Commandery extended the rule of the Four Commande ...

, establishing the new

Daifang Commandery The Daifang Commandery was an administrative division established by the Chinese Han dynasty on the Korean Peninsula between 204 and 220. It was conquered by Goguryeo in 314. History Gongsun Kang, a warlord in Liaodong, separated the southern ...

by splitting off the southern part of Lelang. In 207, Gongsun Kang killed

Yuan Shao Yuan Shao (, ; died 28 June 202), courtesy name Benchu (), was a Chinese military general, politician, and warlord who lived in the late Eastern Han dynasty. He occupied the northern territories of China during the civil wars that occurred tow ...

's sons

Yuan Shang Yuan Shang (died December 207), courtesy name Xianfu, was a Chinese military general, politician, and warlord who lived during the late Eastern Han dynasty of China. He was the third son and successor of the warlord Yuan Shao. In the 14th-centu ...

and

Yuan Xi Yuan Xi (died December 20711th month of the 12th year of the ''Jian'an'' era, per Emperor Xian's biography in ''Book of the Later Han''. The month corresponds to 7 Dec 207 to 5 Jan 208 in the Julian calendar.), courtesy name Xianyi or Xianyong ...

, and gave their heads to

. Gongsun Kang's act was seen as one of compliance to Cao, an attitude his son Gongsun Yuan would reverse.

Gongsun Gong

After Gongsun Kang's death, his two sons Gongsun Huang and Gongsun Yuan were too young to succeed to the title. As a result, his brother Gongsun Gong took the throne. However, he suffered from

diabetes Diabetes mellitus, commonly known as diabetes, is a group of common endocrine diseases characterized by sustained high blood sugar levels. Diabetes is due to either the pancreas not producing enough of the hormone insulin, or the cells of th ...

(''yin xiao'', ) and was infertile. After

Cao Pi Cao Pi () (late 187 – 29 June 226), courtesy name Zihuan, was the first emperor of the state of Cao Wei in the Three Kingdoms period of China. He was the second son of Cao Cao, a warlord who lived in the late Eastern Han dynasty, but the ...

took over

Eastern Han The Han dynasty was an Dynasties of China, imperial dynasty of China (202 BC9 AD, 25–220 AD) established by Liu Bang and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–206 BC ...

, he told Gongsun Gong to give a son as a

hostage A hostage is a person seized by an abductor in order to compel another party, one which places a high value on the liberty, well-being and safety of the person seized—such as a relative, employer, law enforcement, or government—to act, o ...

to Cao. Gongsun Huang, Gongsun Kang's elder son, was sent to

Luoyang Luoyang ( zh, s=洛阳, t=洛陽, p=Luòyáng) is a city located in the confluence area of the Luo River and the Yellow River in the west of Henan province, China. Governed as a prefecture-level city, it borders the provincial capital of Zheng ...

. Gongsun Gong dared not be aggressive towards Cao Wei, and Gongsun Yuan considered him a coward. Claiming that he would restore Liaodong to glory, he forced Gongsun Gong from the throne, imprisoned him and became ruler in December 228.

Gongsun Yuan

Gongsun Yuan claimed friendship with the

and sent envoys in May 229. In February 230, Wei promoted Gongsun Yuan to ''cheqi general'' (). In March 232,

Sun Quan Sun Quan (; 182 – 21 May 252), courtesy name Zhongmou (), posthumous name, posthumously known as Emperor Da of Wu, was the founder of Eastern Wu, one of the Three Kingdoms of China. He inherited control of the warlord regime established by hi ...

sent envoys to Gongsun Yuan to ask for horses, which were supplied. However, when returning in September, the envoys were attacked by Tian Yu. Most of their goods were lost and one of the envoys was killed. In October 232, Gongsun Yuan sent envoys accepting a position as a

vassal A vassal or liege subject is a person regarded as having a mutual obligation to a lord or monarch, in the context of the feudal system in medieval Europe. While the subordinate party is called a vassal, the dominant party is called a suzerain ...

of the Eastern Wu. In March 233, Wu gave him the title of the "King of Yan", and sent two envoys to him; they were killed by Gongsun Yuan and their heads sent to Luoyang, and Gongsun Yuan accepted vassalship from Cao Wei. Gongsun Yuan's attitude angered both

and Eastern Wu;

Cao Rui Cao Rui () (204 or 205 – 22 January 239), courtesy name Yuanzhong, was the second emperor of the state of Cao Wei during the Three Kingdoms period. His parentage is in dispute: his mother, Lady Zhen, was Yuan Xi's wife, but she later remarr ...

(emperor of Cao Wei) and Sun Quan (emperor of Eastern Wu) both vowed to kill him. In 237, Cao Wei general Guanqiu Jian sent troops to attack Gongsun Yuan, but was defeated because of heavy rain.

Gongsun Yuan's reign

After Guanqiu Jian's defeat, Gongsun Yuan claimed independence in July, and used the era date Shaohan (); the new country had a government and officials, and set up four commanderies:

Liaodong The Liaodong or Liaotung Peninsula ( zh, s=辽东半岛, t=遼東半島, p=Liáodōng Bàndǎo) is a peninsula in southern Liaoning province in Northeast China, and makes up the southwestern coastal half of the Liaodong region. It is located ...

, Xuantu,

Lelang The Lelang Commandery was a commandery of the Han dynasty established after it had conquered Wiman Joseon in 108 BC and lasted until Goguryeo conquered it in 313. The Lelang Commandery extended the rule of the Four Commanderies of Han as far ...

and Daifang, and in January 238, Gongsun Yuan resumed relations with Wu, hoping for military reinforcements from it.

Downfall

In June 238, after planning with Cao Rui, the Cao Wei general

Sima Yi Sima Yi (; ; 179 CE7 September 251 CE), courtesy name Zhongda, was a Chinese military general, politician, and regent of the state of Cao Wei during the Three Kingdoms period of China. He formally began his political career in 208 under th ...

led 40,000 soldiers to attack Gongsun Yuan; after a siege lasting three months, Gongsun Yuan's headquarters fell to Sima Yi, who received assistance from

. Many who served in the Yan state were massacred. Gongsun Gong was released from prison.

Relations with Goguryeo

frequently battled with the Gongsun clan despite initial cooperation. In 197, hostilities between the Gongsuns and Goguryeo first broke out when Balgi, elder brother of King Sansang of Goguryeo, staged a rebellion and gained the support of Gongsun Du. Sansang's younger brother Gyesu repelled the attack, defeating Gongsun Du, and Balgi committed suicide. Gongsun Kang took advantage of a succession feud in Goguryeo and launched an attack again in 209, defeating Goguryeo and forcing it to move its capital. In Sima Yi's conquest of Yan, Goguryeo sent thousands of troops to assist Sima Yi.

Impact

Relations between Goguryeo, Cao Wei and Eastern Wu

After Wu's envoys were killed by Gongsun Yuan in 233, some of their troops escaped to Goguryeo and set up an Eastern Wu-Goguryeo alliance. In 234, Cao Wei sent envoys to set up an alliance with Goguryeo. Between Cao Wei and Eastern Wu, Goguryeo chose Cao Weikilling Eastern Wu's envoys in 234 and another set in 236. In 238, Goguryeo sent troops to assist in the defeat of Gongsun Yuan. The Cao Wei-Goguryeo alliance broke down in 242, when King Dongcheon of Goguryeo plundered the Liaodong district of Xi'anping (西安平; near present-day

Dandong Dandong ( zh, s=丹东 , t=丹東 , p=Dāndōng; lit. "Red East"), formerly known as Andong, is a coastal prefecture-level city in southeastern Liaoning province, in the northeastern region of the People's Republic of China. It is the largest ...

) at the mouth of the Yalu River.Tennant 1996 : 22. Original quote: "Wei. In 242, under King Tongch'ŏn, they attacked a Chinese fortress near the mouth of the Yalu in an attempt to cut the land route across Liao, in return for which the Wei invaded them in 244 and sacked Hwando." Cao Wei launched a war in retaliation, which ended in a Cao Wei victory and destroyed the Goguryeo capital of Hwando, sent its King fleeing, and broke the tributary relationships between Goguryeo and the other tribes of Korea that formed much of Goguryeo's economy.Gardiner 1969 : 34. Although the King evaded capture and eventually settled in a new capital, Goguryeo was reduced to such insignificance that for half a century there was no mention of the state in Chinese historical texts.Byington 2007 : 93.

Five Barbarians

Sima Yi's conquest of Gongsun Yuan was attributed partly with the

Uprising of the Five Barbarians The Upheaval of the Five Barbarians also translated as the Uprising, Rebellion or the Revolt of the Five Barbarians () is a Chinese expression used to refer to a chaotic period of warfare from 304 to 316 during the fall of the Western Jin dynas ...

Incident, through increasing the financial power of Liaodong and forcing Han people in Liaodong to move inland, allowing the

Xianbei The Xianbei (; ) were an ancient nomadic people that once resided in the eastern Eurasian steppes in what is today Mongolia, Inner Mongolia, and Northeastern China. The Xianbei were likely not of a single ethnicity, but rather a multiling ...

to enter Liaodong.

References

{{reflist *Ikeuchi, Hiroshi. "A Study on Lo-lang and Tai-fang, Ancient Chinese prefectures in Korean Peninsula". Memoirs of the Research Department of the Toyo Bunko 5 (1930). 79–95. *Gardiner, K.H.J.
The Kung-sun Warlords of Liao-tung (189–238)
. ''Papers on Far Eastern History'' 5 (Canberra, March 1972). 59–107. *Gardiner, K.H.J. "The Kung-sun Warlords of Liao-tung (189–238) – Continued". ''Papers on Far Eastern History'' 6 (Canberra, September 1972). 141–201. *Byington, Mark E
"Control or Conquer? Koguryŏ's Relations with States and Peoples in Manchuria,"
''Journal of Northeast Asian History'' volume 4, number 1 (June 2007): 83–117. Former countries in Chinese history Former kingdoms Three Kingdoms 237 230s disestablishments 230s establishments