The division of the Gongsun clan in Liaodong began with Gongsun Yuan's grandfather, Gongsun Du. Gongsun Du www.biquge.info was originally a native of Xiangping, Liaodong, and later followed his father to Xuansu, where he was appreciated by Xuansu's Taishou Gongsun Chen, who helped him learn from the teacher and marry a wife. In the third year of Jianning (170 AD), Gongsun Du was appointed as Shang Shulang, and later served as the assassin of Jizhou, with a prominent position, but was rumored and dismissed.

It was not until the sixth year of Zhongping (189 AD) that Dong Zhuo became the ruler, and Xu Rong, who was in the same county as Gongsun Du, recommended him as the Taishou of Liaodong, and then he was able to make a comeback. Upon his arrival, Gongsun Du immediately eliminated dissidents from the county and established his prestige, and then sent troops to attack Goguryeo.

At this time, Goguryeo was under the reign of the new king Bogu (126 AD to 191 AD), and he fought against the Han army several times in the past few decades, plundering the Goguryeo counties on the Han border. At this time, he was subdued by Gongsun Du and served. In the following year (190 AD), the new king sent Dajia Youju and the chief bookkeeper to assist Gongsun Du and destroy the rich mountain bandits together. At that time, Gongsun Du's ambitions were inflated, and he established himself as the Marquis of Liaodong and the pastor of Pingzhou, and openly acted independently of Middle Earth.

After that, Gongsun Du sent Liu Yi to cross the sea and Donglai counties in Qingzhou, and ordered him to be the assassin of Yingzhou, completely controlling the passage of the present-day Bohai Sea and the Yellow Sea. Gongsun Du defeated the three counties Wuhuan in the west, leveled the eastern and western boundaries of Liao, and merged Xuansu and Lelang in the east. In order to contain Goguryeo and other countries, he married the daughter of the clan to the king of Fuyu, so that he would be loyal to himself. Gongsun Du became the overlord of Northeast Asia for a while.

In the ninth year of Jian'an (204 AD), Gongsun Du died of illness, and his son Gongsun Kang ascended the throne. At this time, Cao Cao in the north was sweeping away the sons of Yuan Shao, and there was a lot of pressure on the Gongsun clan. In the tenth year of Jian'an (205 AD), Cao Cao broke Yuan Tan, and Zhang Liao led the army to defeat Shi Liuyi, the assassin of Yingzhou placed by Gongsun Du, and captured Donglai of Gongsun. In the twelfth year of Jian'an (207 AD), Cao Cao broke the three counties of Wuhuan, Tuliucheng, Yuan Shang and others took refuge in Gongsun Kang, and was later killed by Kang and sacrificed to Cao Cao. Under Cao Cao's strength, Gongsun Kang could only temporarily express his submission, and later accepted Cao Cao's award of Xiangping Marquis and General Zuo.

However, when Cao Cao set his sights on the south, Gongsun Kang was also obviously active. Around 209 AD, Gongsun Kang took advantage of the discord between King Yiyimo and his brother on Goguryeo Mountain, defeated the Goguryeo army, captured the capital of Goguryeo, and forced Yiyimo to move the capital to Marudu. Later, Gongsun Kang divided the wasteland south of Tunyou County of Lelang County into a belt county, and sent Gongsun Mo, Zhang Chang and others to collect the remnants and raise troops to fight against Han Hao, so that Lelang and the belt side also prospered. While subduing Samhan by force, Gongsun Kang also followed his father's policy of harmony and subjugation, and married his daughter to Baekje, the most powerful of the Mahans, and Baekje became a vassal state of the Gongsun clan.

After the establishment of Obiban-gun, the influence of the Gongsun clan in Northeast Asia reached its limit, and after that, the Samhan provinces in the southern part of the Korean Peninsula and the Wa provinces in the northern part of present-day Kyushu (which belonged to the Yamadai Queen) were attached to Obiban-gun, and all tributes to the Gongsun clan were taken care of by Obikai Taishou. By this time, the city had become the land of Huanai, Fuyu, Sanhan, and Wa were all attached, Goguryeo and Wuhuan were all ruined, and the power of the Gongsun clan was not dared to resist in the countries of Northeast Asia. Moreover, the Gongsun clan has owned Liaodong for several generations, and the Son of Heaven thought that it was a unique domain and entrusted it with overseas affairs, so he cut off Dongyi, completely cut off the connection between Middle-earth and other countries, and was dictated in Liaodong. In this way, the Gongsun clan has the weight of various countries and is not afraid of the threat of the Middle-earth Dynasty.

Some people may be puzzled how the wilderness of Liaodong, with only the four counties of Liaodong, Xuansu, Lelang, and Daifang, can become the overlord of Northeast Asia and the suzerainty of the three Hans, Wa, and Fuyu countries. In fact, the Gongsun Clan's territory was already quite entrenched at this time. "Book of the Later Han Dynasty" and "County Chronicles" record the number of household registrations in Liaodong, Xuansu, and Lelang (including later Belt Fang) counties in the fifth year of Emperor Yonghe (AD 140): 64,158 households in Liaodong County, and 81,714 mouths (W case: the number of mouths is wrong, with a household of five mouths, when it is about 320,000 mouths, there are "Book of Jin" and "Emperor Xuanji" when Sima Yiping Liaodong "received 40,000 households, and more than 300,000 mouths" as evidence, and this number of mouths should be taken off "20", which is more than 280,000); Xuanwu County has 1,594 households, and 43,163 mouths (W case: the number of households is wrong, "1,000" should be "10,000"); Lelang County: 61,492 households, 257,550 mouths. A total of nearly 600,000 people. On the one hand, there is a natural increase, according to the law of thousands of years in ancient China, the annual growth rate is about 0.12%, from the fifth year of Yonghe to the fifteenth year of Jian'an, that is, 210 AD, it can increase by 8.7%, that is, about 50,000 people; On the other hand, the Central Plains is in turmoil, and scholars and displaced people will naturally flow into Liaodong, which is relatively stable in the Central Plains, and tens of thousands of mouths will also increase; On the other hand, Gongsun Kang and others attacked the surrounding small countries, forcing the old people to come back and looting foreign slaves, which also increased the population. For example, "Chronicles of the Three Kingdoms", "Wei Zhi" and "Dongyi Biography" contain "Baqi resentment is a brother and cannot stand, and Juan Nujia will each go down to more than 30,000 mouths and surrender, and live in boiling water." "On the whole, before the destruction of Xiangping City, the Gongsun clan received more than 600,000 mouths, or even 700,000 mouths. According to the ratio of soldiers to civilians at that time, which was about 1:10, the army that Gongsun could mobilize was also 60,000 or 70,000.

Looking at the situation of various countries during the same period, when Shu Han was destroyed by Wei, there were "940,000 mouths and 102,000 soldiers with armor", and when Wu was destroyed, "230,000 soldiers and 2.3 million men and women". Compared with the two countries of Wu and Shu, the territory of the Gongsun clan is indeed smaller, but it is by no means too weak, at least it can be considered to be of the same magnitude. At that time, there were only 30,000 households in Goguryeo; 5,000 households; 20,000 households; More than 50 countries in Malaysia and South Korea have "more than 10,000 large countries, thousands of small countries, and a total of more than 100,000 households"; "Ben, Chen, and Han are united in 24 countries, 45,000 large countries, 6,700 small countries, and a total of 450,000 households"; There are as few as 1,000 households, and at most there are only 70,000 households in the Yamatai Kingdom, totaling 150,000 households, but the state structure is loose; There are only 80,000 households, which is more than in other countries. In this situation where Northeast Asia is full of small countries, it is easy for the Gongsun clan to use them to contain each other, so that they are all under their control.

In the later period of Jian'an, Gongsun Kang died, and his younger brother Gongsun Gongli did nothing. In the second year of Wei Taihe (228 AD), Kang Ziyuan seized the throne. At this time, the Xianbei Murong clan flowed into Liaoxi, and there may be friction with it, but it is not Gongsun Yuan's opponent. In 229 AD, Sun Quan of Wu was proclaimed emperor and officially confronted Wei. Since then, Wu has also sought overseas vassals and territories, and has sent fleets to the sea many times to visit Yizhou and Bozhou. However, the large and small countries in the East China were basically the subject states of the Gongsun clan, and the Wu State had almost no way to intervene, so Sun Quan had no choice but to seek an alliance with Gongsun Yuan. With the support of Wu, Gongsun Yuan's ambitions grew more and more, which led to his eventual rupture with Wei and his own proclamation as King of Yan in the first year of Jingchu (237 AD). In the end, Emperor Wei Ming made up his mind to exterminate this separatist regime that had existed in Liaodong and Korea for fifty years, and Murong Xianbei and Goguryeo's Dongchuan Throne Palace also participated in the crusade against Xiangping.