9 events the sources record for this year, grouped by region.
What happened
China (6)
The Ganlu Incident: the eunuch Qiu Shiliang led troops, killed chancellors Wang Ya and others, and wiped out more than ten clans. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷17下 大和9年)
Li Xun and others plotted to remove the eunuchs but failed; Qiu Shiliang killed ministers including Wang Ya (the Sweet Dew Incident). (New Book of Tang (Xin Tangshu), Annals 新唐書 卷008 穆宗~宣宗 大和9年11月)
Zhang Zhongqing, the eunuch army supervisor of Fengxiang, killed military governor Zheng Zhu. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷008 穆宗~宣宗 大和9年11月)
In March the Dazaifu reported that Silla traders kept coming to spy on Iki Island, and asked that 330 islanders be armed to guard fourteen key coastal points; permission was granted. (Shoku Nihon Kōki 續日本後紀 卷第四 (원문 29번째 단락))
In March, on the death of the hōshi (Kūkai), an inner attendant (naitoneri) was sent to condole, mourning gifts were given, and the retired emperor Junna sent a letter of condolence. (Shoku Nihon Kōki 續日本後紀 卷第四 (원문 33번째 단락))
The Ganlu Incident: when Han Yue begins to sweat and turns pale, Qiu Shiliang and others sense the plot and report it to the emperor. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷245)
Japan (2)
In February Chōmine no Takana was appointed quasi-judge for the Tang mission, Matsukawa no Sadatsugu as recorder, and interpreters were appointed. (Shoku Nihon Kōki 續日本後紀 卷第四 (원문 14번째 단락))
In December Noto Province reported that drought and epidemics had persisted and that the people were starving; relief was given. (Shoku Nihon Kōki 續日本後紀 卷第四 (원문 114번째 단락))
Western Europe (1)
A great fleet came to West Wales and joined the natives; Egbert defeated the Welsh and Danes at Hingston. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 835 항 (pg657.txt 줄 2571))