Maritime East Asia (244–387 CE): Fragmentation, Cultural Evolution, and Regional Realignments

Between 244 CE and 387 CE, Maritime East Asia—comprising lower Primorsky Krai, the Korean Peninsula, the Japanese Archipelago below northern Hokkaido, Taiwan, and southern, central, and northeastern China—experiences profound political fragmentation, regional realignments, cultural evolution, and technological innovation following the collapse of the Han dynasty.

Fragmentation and the Rise of Regional Powers

The collapse of the Han dynasty ushers in nearly four centuries of fragmentation, beginning with the era of the Three Kingdoms (Wei, Shu, and Wu, 220–280 CE). While later romanticized for chivalry, this era is marked by widespread warfare. The brief reunification under the early Jin dynasty (265–420 CE) proves fragile, unable to withstand persistent invasions by northern nomadic groups.

Forced to flee from Luoyang in 317 CE, the Jin court relocates to Nanjing, signaling China's division into successive dynasties and kingdoms lasting until 589 CE. This period sees accelerated sinicization, as non-Chinese groups integrate culturally, notably accompanied by the spread of Buddhism, introduced in the first century CE.

Technological and Cultural Advancements

Despite political fragmentation, significant technological advancements occur. Innovations such as gunpowder(initially for fireworks), the wheelbarrow, and notable developments in medicine, astronomy, and cartography emerge during this turbulent period.

Developments in Korea: Baekje, Goguryeo, and Silla

On the Korean Peninsula, three powerful states emerge: Baekje in the southwest, Goguryeo in the north, and Silla in the southeast.

Baekje, known for its centralized aristocratic structure, emerges strongly by 246 CE, aggressively expanding northward. Its King Kun Ch'ogo (r. ca. 346–375) establishes a lasting royal succession tradition, and in 384 CE, Buddhism is officially adopted as the state religion.

Goguryeo, initially developed near the Yalu River, expands significantly, conquering the Chinese-held region of Lelang in 313 CE. Situated in rugged terrain and harsh climates, Goguryeo becomes a major regional power, heavily influencing Korean history and identity, particularly as claimed by modern North Korea.

Silla, with its capital at Kyongju, becomes known for its cultural richness. The ruling elites from Silla’s region will notably dominate South Korean political leadership in later historical periods, shaping its national historical narrative.

The Kofun Period in Japan

In Japan, the Kofun period represents a critical evolutionary stage toward state formation. Society flourishes particularly along the eastern Inland Sea, with Japanese military influence extending onto the southern Korean Peninsula. Early Japanese rulers actively seek and obtain diplomatic recognition from China. Chinese records from this period describe the Japanese (Wa) society as fragmented, yet increasingly centralized under powerful leaders like the famed queen Himiko of Yamatai, who maintains diplomatic relations with China’s Wei Dynasty (220–265 CE).

Influence of Migration: Wu Hu Tribes

The period witnesses significant migrations into China by various non-Chinese tribes collectively termed the Wu Hu (Five Hu). Initially pastoral nomads from the steppe regions, these tribes leverage the collapse of central authority to settle extensively in the fertile North China Plain, reshaping the region’s demographic and cultural landscape.

Legacy of the Age: Political Realignment and Cultural Foundations

Thus, the age from 244 to 387 CE is characterized by political fragmentation, significant cultural evolution, and regional realignments. Despite instability, this era establishes enduring cultural and political foundations, significantly influencing the historical trajectories of China, Korea, and Japan.

The collapse of the Han dynasty had been followed by nearly four centuries of rule by warlords.

The age of civil wars and disunity had begun with the era of the Three Kingdoms (Wei, Shu, and Wu, which had overlapping reigns during the period CE 220-80).

In later times, fiction and drama greatly romanticize the reputed chivalry of this period.

Unity is restored briefly in the early years of the Jin dynasty (CE 265-420), but the Jin cannot long contain the invasions of the nomadic peoples.

The Jin court is forced to flee from Luoyang in 317 and reestablishes itself at Nanjing to the south.

The transfer of the capital coincides with China's political fragmentation into a succession of dynasties that is to last from 304 to 589.

During this period the process of sinicization accelerates among the non-Chinese arrivals in the north and among the aboriginal tribesmen in the south.

This process is also accompanied by the increasing popularity of Buddhism (introduced into China in the first century CE) in both north and south China.

Despite the political disunity of the times, there are notable technological advances.

The invention of gunpowder (at this time for use only in fireworks) and the wheelbarrow is believed to date from the sixth or seventh century.

Advances in medicine, astronomy, and cartography are also noted by historians.

Each of the expeditions launched by Shu Han general Jiang Wei has ultimately been aborted due to inadequate food supplies or battlefield losses.

Jiang Wei's fifteen years of campaigning have drained Shu's already limited resources, and lead to the eventual downfall of Shu in 263 at the hands of its rival, Wei.

The conquest ends the tripartite equilibrium maintained in China for over forty years since the end of the Han Dynasty in 220 and signifies the beginning of a reunified China under the Jin Dynasty.

Sun Hao, born in 242, is the oldest son of Sun He, a one-time crown prince of the founding emperor Sun Quan, created so following the death of his father Sun Quan's oldest son and first crown prince, Sun Deng, in 241.

Sun Hao’s mother was a concubine of Sun He's, Consort He.

In 250, when Sun Hao was just eight, after Sun Quan tired of constant disputes between Sun He and his brother Sun Ba, the Prince of Lu, he had ordered Prince Ba to commit suicide and deposed Crown Prince He, who was exiled to Guzhang (in modern Huzhou, Zhejiang), presumably with his family, and reduced to commoner status.

Sun Hao thus went from the status of eventual presumed heir to being the son of a commoner, albeit the grandson of the emperor.

Crown Prince He's status had been elevated from commoner status in 252 as Sun Quan, just before his death that year, created him the Prince of Nanyang, with his fief at Changsha.

Indeed, there were rumors, even after Sun He's younger brother Sun Liang took the throne after Sun Quan's death, that the regent Zhuge Ke, an uncle of Sun He's wife Princess Zhang, was interested in restoring Prince He and making him emperor instead.

After Zhuge's assassination and replacement by Sun Jun in 253, however, Prince He fell into danger, as Sun Jun had been instrumental in having him deposed in the first place and wanted to eliminate any chance of a comeback.

Using the rumors as excuse to have Sun He demoted back to commoner status and exiled to Xindu (in modern Hangzhou, Zhejiang), he then sent messengers to force Sun He to commit suicide.

Princess Zhang also committed suicide, but when offered the chance to, Consort He refused—stating that if she died as well, no one would be left to care for Sun He's sons, so she raised Sun Hao and his three brothers by other consorts—Sun De, Sun Qian, and Sun Jun.

Sun Hao was just 11 when his father died.

After Sun Liang was deposed by Sun Jun's cousin and successor Sun Lin in 258, another uncle of Sun Hao's, Sun Xiu, became emperor, and that year, Sun Xiu created Sun Hao and his brothers Sun De and Sun Qian marquesses.

Sun Hao's title was the Marquess of Wucheng, and he was sent to his march (in modern Huzhou, Zhejiang).

At some point, he befriended a magistrate of Wucheng County, Wan Yu, who believed him to be intelligent and studious.

Sun Xiu falls ill in summer 264 and is unable to speak but still can write, so he writes an edict summoning the prime minister Puyang Xing to the palace, where he points and entrusts his son, Sun Wan the Crown Prince, to him.

Sun Xiu dies soon thereafter.

However, Puyang does not follow his wishes but rather, after consulting with the powerful general Zhang Bu, forms the belief that the people are, in light of key ally Shu Han's recent fall in 263, yearning for an older emperor.

(It is not known how old Crown Prince Wan was at this point, but Sun Xiu himself died at age 29, so it was unlikely that Crown Prince Wan was even a teenager.)

At the recommendation of Wan Yu, who is by this point a general, Puyang and Zhang declare Sun Hao emperor instead.

At first, the people of Eastern Wu are impressed with the new emperor, as he reduces taxes, gives relief to the poor, and releases a large number of ladies in waiting from the palace to let them marry.

However, that hopefulness is soon shattered, as Sun Hao starts to be cruel in his punishments, superstitious, and indulging in wine and women.

He also demotes his aunt, Sun Xiu's wife Empress Dowager Zhu to the title of "Empress Jing."

(He honors his mother Consort He as the empress dowager instead, while posthumously honoring his father Sun He with the title Emperor Wen.)

Puyang and Zhang are shocked and disappointed: when their disappointment is reported to the emperor, he has them arrested and executed, together with their clans, late in 264.

In 264, he also creates his wife Marchioness Teng empress.

The kingdom of Wèi had conquered Shu Han in 263-64.

Shortly afterwards, in 265, the Wèi dynasty had been overthrown by its last Imperial Secretariat, Sima Yan, grandson of Sima Yi, who founds China’s Western Jin dynasty.

Ruling as Wu Di (Emperor Wu), he has brought a semblance of unity to China.

Sun Hao forces the former Empress Dowager Zhu to commit suicide in 265 and exiles Sun Xiu's four sons—and soon executes the two oldest, Prince Wan of Yuzhang (the former crown prince) and Prince Gong of Ru'nan.

He then also, believing in a prophecy that the imperial aura had moved from Yang Province (modern Zhejiang, Jiangxi, and southern Jiangsu and Anhui) to the Jing Province (modern Hubei and Hunan) and that Jing forces would defeat Yang forces, undertakes a costly move of the capital from Jianye to Wuchang (modern Ezhou, Hubei).

He also begins regularly executing officials who show disapproval of his wasteful ways.

The only major official who is able to speak freely without consequences is Lu Kai, the nephew of Lu Xun and one of the prime ministers serving in tandem with Wan Yu, because of the great respect the people have for Lu.

Jin, having newly established itself as the successor to Eastern Wu's archenemy Cao Wei after its first emperor, Emperor Wu (Sima Yan) usurped the Cao Wei throne, seeks in 266 to establish peace with Eastern Wu.

Sun Hao instead considers attacking Jin, and while he does not do so at this point, he does not establish peace with Jin.

Also in 266, commoners in modern Zhejiang, unable to withstand Sun Hao's heavy levies (to support his luxuries), rebel and kidnap Sun Hao's brother Sun Qian as a figurehead.

They reach Jianye but are eventually defeated by Ding Gu and Zhuge Jing, who are responsible for Jianye's defense.

Although there is no evidence that Sun Qian is actually involved in the rebellion, Sun Hao has not only Sun Qian but also his mother and his younger brother Sun Jun, by the same mother, executed.

Sun Hao thinks this to be the fulfillment of the prophecy that had prompted his move of the capital to Wuchang, and later this year, he moves the capital back to Jianye.

Chinese philosophers Guo Xiang and Wang Bi, who believe in the controlling of emotions and in a supreme unifying principle of non-being, influence the creation of Neo-Taoism.

Axum, named by Mani as one of the four great powers of his time along with Persia, Rome, and China, has begun minting its own currency by the late third century.