7 events the sources record for this year, grouped by region.
What happened
Japan (2)
During a drought, Shōsōzu Kūkai requests that the Buddha relic be brought into the inner palace for worship and the ritual bathing of images; rain falls. (Nihon Kōki (Later Chronicles of Japan) 日本後紀 卷35)
Earthquake. The court reports to the Saho mausoleum its intention to strengthen the Rushana (Vairocana) Great Buddha of Tōdai-ji, sending the councillor Fujiwara no Aratachi and others. (Nihon Kōki (Later Chronicles of Japan) 日本後紀 卷35)
Southern Europe (1)
An army sent by the Saracen king Abdirraman to aid Aeizo arrives at Zaragoza. The emperor sends his son Pippin, king of Aquitaine, with a great army, but the commanders are late; Abu Marwan devastates the plains of Barcelona and Gerunda, and withdraws to Zaragoza before the Franks even see him (Royal Frankish Annals ARF a.827, Kurze 1895 p.173)
Western Europe (4)
Egbert conquered the kingdom of Mercia and all the land south of the Humber, and became the eighth ruler over all of Britain. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 827 항 (pg657.txt 줄 2534))
Aeizo, trusting in Saracen support, harms the garrisons of the Spanish frontier; Villemundus, son of Bera, and others join him in raiding Ceritania and Valencia. The emperor sends Abbot Elisacar to settle matters, while Bernard, count of Barcelona, resists to the end (Royal Frankish Annals ARF a.827, Kurze 1895 p.172)
The emperor holds two assemblies: one at Neumagen, because of the false promises of Horich, son of Godofrid of Denmark; the other at Compiègne, where he receives tribute and gives instructions to those who will be sent to the Spanish frontier. Until early winter he stays at palaces such as Compiègne and Carisiacus (Royal Frankish Annals ARF a.827, Kurze 1895 p.173)
The Bulgars, with a fleet, devastate with fire and sword the Slavs who had settled in Pannonia, driving them to the Drava River; they expel their leaders and install Bulgar rulers (Royal Frankish Annals ARF a.827, Kurze 1895 p.173)