Geunchogo sacks Goguryeo’s largest city, Pyongyang, in 371 and his son Geungusu kills King Gogukwon of Goguryeo in battle.

At the end of these conquests, Baekje rings the Yellow Sea, and controls much of the Korean peninsula, including all of Gyeonggi, Chungcheong, and Jeolla and parts of Gangwon and Hwanghae provinces.

The fortified cities of the Danube, with Sirmium at the forefront, contribute to stop an invasion of the Quadi.

The deteriorating state of affairs in the East had been among Valens' reasons for contracting a hasty and not entirely favorable peace with the Goths in 369.

Already in the summer following his Gothic settlement, Valens had sent his general Arinthaeus to re-impose Pap on the Armenian throne.

This had provoked Shapur himself to invade and lay waste to Armenia.

Pap, however, had once again escaped and been restored a second time under escort of a much larger force in 370.

The following spring, larger forces are sent under Terentius to regain Iberia and to garrison Armenia near Mount Npat.

When Shapur counterattacks into Armenia in 371, his forces are bested by Valens' generals Traianus and Vadomarius at Bagavan.

Faustus of Byzantium gives considerable credit for the victory to sparapet Mushegh Mamikonian.

(Sparapet, an Arrmenian military title, was traditionally held by the House of Mamikonian during the first centuries of the rule of the Arsacid kings.)

During the ensuing battles, more Armenian territories are reclaimed from the Persians, including Arzanene and Corduene which had been ceded to Persians by Jovian in 363.

By the end of the summer, Shapur retreats to his capital at Ctesiphon and Valens goes back to Antioch.

Valens has overstepped the 363 treaty and successfully defended his transgression.

A truce settled after the 371 victory is to hold as a quasi-peace for the next five years.

Shapur will be unable to confront the massive Roman buildup in Armenia as a result of his preoccupation with attacks in the eastern realm of his empire.

While peace prevails with Persia, the situation inside Armenia begins to crumble.

Maximinus had been promoted within a year to vicarius of Rome, and from July 13, 371, serves as praetorian prefect of Gaul, providing a direct link between the emperor and the civil administration in Roman Britain and Gaul.

Baekje continues substantial trade with Goguryeo, and actively adopts Chinese culture and technology.

In 372, the first diplomatic ties are established between Baekje and the Eastern Jin court.

Gogukwon’s son and successor, Sosurim, born as Go Gu-Bu and made crown prince in 355, had assisted his father in leading the country and strengthening royal authority.

Turning to domestic stability and the unification of various conquered tribes, he establishes state religious institutions to transcend tribal factionalism.

Having received Buddhism through traveling monks of Former Qin, he builds temples to house them, embracing Buddhism as the national religion in 372.

In the same year, he establishes a national educational institute called the Taehak, a Confucian institution meant to educate the children of the nobility.

Sosurim promulgates a code of laws in 373 that centrally codifies regional customs and serves as the national constitution.

The Arianist Valens has fallen under the influence of legists, such as the praetorian prefect Modestus, who has instituted harsh persecutions in Antioch of the educated pagan elite.

Valens has exiled even moderate Nicaean bishops and granted to Arians favors that have aroused violent reactions from the orthodox, whose power has increased in the East, which his policies have made prey to violent religious passions.

Valens banishes bishops who had been restored by Julian, although near the end of his reign he relents somewhat and allows these exiles to return.

After suppressing the conspiracy of Theodorus at Antioch in the winter of 371-372, Valens becomes involved in a new conflict with Persia.

The Eastern Jìn court has managed to survive the rebellions of Wang Dun and Su Jun.

Another rebellious military leader, Huan Wen, had been perceived as one of the greatest generals since Jin's loss of northern China.

He had led the campaign that destroyed Cheng Han and annexed its lands to Jin, and had had some successes against the northern states Former Qin and Former Yan (although both campaigns ultimately ended in failure, perhaps due to his overcautiousness).

Huan Wen dies in 373 before he can carry out his intention to usurp the throne, but the Huan clan will remain entrenched in the Jin power structure for decades to come.

The Huns, victorious in the Battle of the Tanais River, fought on the traditional border between Asia and Europe, destroy the empire of the Alans and cross the Volga and the Don.

The rise of the Huns, which puts pressure on all the Germanic tribes to the immediate west, soon overwhelms the Gothic kingdoms.

Many of the Goths migrate into Roman territory in the Balkans, while others remain north of the Danube under Hunnic rule.