10 events the sources record for this year, grouped by region.
What happened
China (3)
Emperor Wenzong tried to depose Crown Prince Li Ying; after he was moved to Shaoyang Palace, the crown prince died (posthumous title Zhang). (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷17下 開成4年)
In the ninth month, the envoy-in-chief Fujiwara no Tsunetsugu returned the sword of authority. (Shoku Nihon Kōki 續日本後紀 卷第八 (원문 85번째 단락))
Korean Peninsula (2)
Kim Yang's army fought again on the hill of Dalbeol and won a great victory; more than half of King Minae's army died. (Samguk Sagi (History of the Three Kingdoms) 卷10 閔哀王 2年)
King Sinmu, after his accession, Gungbok (Gungbo) of the Cheonghae garrison, resentful of having been broken of a promise, was lured by Yeomjang and killed with a sword. (Samguk Yusa (Memorabilia of the Three Kingdoms) 紀異第二 神武大王閻長 弓巴)
Japan (4)
In the seventh month, the Dazaifu was ordered to build a ship modeled on Silla ships, which withstand storms. (Shoku Nihon Kōki 續日本後紀 卷第八 (원문 69번째 단락))
In the eighth month, Ōmiwa no Munao, a recorder of the Tang embassy, submitted a memorandum to the Dazaifu: the three ships, distrusting the main vessel, borrowed nine Silla ships at Chuzhou and returned along the southern coast of Silla; Munao was on the sixth ship, and the others' whereabouts are unknown. (Shoku Nihon Kōki 續日本後紀 卷第八 (원문 76번째 단락))
In the tenth month, one Silla ship carrying the Tang recorder Yamashiro no Ujimasu arrived at Hakata Port in Chikuzen. (Shoku Nihon Kōki 續日本後紀 卷第八 (원문 96번째 단락))
In the tenth month, after over ten days of rain and thunder on the western shore of Tagawa District, Dewa Province, stones shaped like arrowheads and spearheads were reported to have fallen; Mutsu, Dewa and the Dazaifu were ordered to prepare for unusual events. (Shoku Nihon Kōki 續日本後紀 卷第八 (원문 98번째 단락))
Western Europe (1)
A great slaughter took place at London, Canterbury, and Rochester (London is chosen as the representative site). (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 839 항 (pg657.txt 줄 2599))