6 events the sources record for this year, grouped by region.
What happened
China (1)
In February 774 (Xinwei day), the Xuzhou troops rise in rebellion, and Governor Liang Sheng flees over the wall. (Zizhi Tongjian (Comprehensive Mirror) 권225 774년 항)
Japan (2)
The Emishi of the Kaidō burn the bridge, block the road, invade Momonoo castle and break down its western outer wall. (Shoku Nihongi (Continued Chronicles of Japan) 續日本紀 卷第33 「壬戌。陸奥國言。海道」)
The garrison generals report the Emishi as being on the level of rat thieves, and the sovereign reprimands them for rashness. (Shoku Nihongi (Continued Chronicles of Japan) 續日本紀 卷第33 「辛夘。先是。天皇依鎭」)
Western Europe (3)
At Easter the Northumbrians drove King Alhred out of York and made Æthelred king. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 774 항 (pg657.txt 줄 2254))
The Mercians and the Kentish fought at Otford. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 774 항 (pg657.txt 줄 2254))
While Charles is in Italy, the Saxons take the opportunity to raid the border of neighboring Hesse with fire and sword (Royal Frankish Annals ARF(Einhard판) a.774, Kurze 1895 p.37)