26 events the sources record for this year, grouped by region.
What happened
China (22)
The Jingyuan army left Chang'an and rebelled at Chanshui, reversing their spears (the Jingyuan Incident). (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷12 建中4年 10月)
Zhu Ci's army attacked Fengtian city from three sides, and Hun Jian defended it with all his strength. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷12 建中4年)
Zhang Yi, Military Governor of Fengxiang, held a covenant at Qingshui with the Tibetan minister Shang Jiezan. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷007 德宗·順宗·憲宗 建中4年1月)
Yao Lingyan, Military Governor of Jingyuan, rebelled and attacked Chang'an (the Jingyuan mutiny). (New Book of Tang (Xin Tangshu), Annals 新唐書 卷007 德宗·順宗·憲宗 建中4年10月)
An imperial order to the provinces of the peninsula: because the Emishi rise and military levies are frequent and the realm is exhausted, envoys are sent to comfort them and the granaries are opened to supply them. (Shoku Nihongi (Continued Chronicles of Japan) 續日本紀 卷第37 「乙丑。勅坂東諸國曰。」)
In the eleventh year of Hōki, the people of the two districts of Ōkachi and Hiraka were plundered by the enemy; the military administration was rebuilt, but as tribute was hard to pay, a three-year exemption is granted by imperial decree. (Shoku Nihongi (Continued Chronicles of Japan) 續日本紀 卷第37 「六月丙午朔。出羽國言」)
Western Europe (3)
His wife, Queen Hildegard, dies on April 30. The king had just spent the winter at Theodonis villa (Royal Frankish Annals ARF(Einhard판) a.783, Kurze 1895 p.65)
Charles fights the Saxon army at Theotmelli and nearly annihilates it; he withdraws to Paderborn to await reinforcements, then at the River Hase on the Westphalian border again defeats the Saxon army gathered there, and devastates the land via the Weser as far as the Elbe (Royal Frankish Annals ARF(Einhard판) a.783, Kurze 1895 p.65)
Charles marries Fastrada, daughter of Count Radolf. In the same year his mother Bertrada dies on July 12. The king spends winter, Christmas and Easter at Herstal (Royal Frankish Annals ARF(Einhard판) a.783, Kurze 1895 p.67)
Changes of power ◆
Places where the world territory data shows a change of borders in this year.
◆ Pratihara dynasty takes 192,500 km² of former Pala Empire land
◆ Pala Empire loses 192,500 km² to Pratihara dynasty