10 events the sources record for this year, grouped by region.
What happened
China (4)
U-jing, fearing the calamity, boarded a ship with his wife and children at the mouth of the Hwangsan crossing and took refuge with Gungbok, envoy of Cheonghae Garrison. (Samguk Sagi (History of the Three Kingdoms) 卷10 僖康王 2年)
In February Mutsu Province, citing the need for crossbow troops, asked that a crossbow master (doshi) be placed as at a Chinjufu; permission was granted. (Shoku Nihon Kōki 續日本後紀 卷第六 (원문 19번째 단락))
In March a comet appeared to the southeast, its tail reaching to the edge of the sky. (Shoku Nihon Kōki 續日本後紀 卷第六 (원문 27번째 단락))
In April Sakanoue no Kiyono, Mutsu-Dewa azechi, reported on the notice of the Chinju-shōgun: rumors had made the people flee in panic and the fushū captives were agitated; he asked for one thousand reinforcements. (Shoku Nihon Kōki 續日本後紀 卷第六 (원문 47번째 단락))
Japan (4)
In March Tang envoy Fujiwara no Tsunetsugu left the Rokurō-kan and set out for the Dazaifu (second attempt). (Shoku Nihon Kōki 續日本後紀 卷第六 (원문 37번째 단락))
In July three of the Tang ships set out from Mineraki Cape in Matsura District; the first and fourth ships were blown by head winds to Iki Island, and the second drifted to Chika Island. (Shoku Nihon Kōki 續日本後紀 卷第六 (원문 73번째 단락))
In the eighth month, the Dazaifu reported that three of the Tang embassy ships had come back, and the upper envoys' memorials. (Shoku Nihon Kōki 續日本後紀 卷第六 (원문 80번째 단락))
In the twelfth month, from dawn to night a great wind blew; houses in the capital were damaged in many places. (Shoku Nihon Kōki 續日本後紀 卷第六 (원문 107번째 단락))
Western Europe (2)
Ealdorman Wulfherd fought thirty-three pirate ships at Hamton and won, but he died the same year. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 837 항 (pg657.txt 줄 2586))
Ealdorman Æthelhelm fought with the men of Dorset on the Isle of Portland against the Danish army and was killed; the Danes took the field. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 837 항 (pg657.txt 줄 2586))