9 events the sources record for this year, grouped by region.
What happened
China (5)
The Buddha's finger bone relic was welcomed into Fengxiang, prompting Han Yu's remonstrance. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷007 德宗·順宗·憲宗 元和13年12月)
An earthquake struck Sagami, Musashi, Shimōsa, Hitachi, Kōzuke and Shimotsuke: mountains collapsed and valleys were filled over several li, and the people crushed to death were uncountable. In the eighth month envoys were sent to patrol and provide relief. (Nihon Kōki (Later Chronicles of Japan) 日本後紀 卷27)
Western Europe (3)
Having punished Bernard's gang, the emperor, with a great army, invades Britannia (Brittany), holds a general assembly at Benedis, takes the rebel strongholds and easily subdues the whole region. Mormanus, who posed as king, is killed by the imperial army (Royal Frankish Annals ARF a.818, Kurze 1895 p.148)
After the campaign the emperor disbands the army and returns to the town of Angers, where his queen Irmingard, who was ill, dies on October 3, two days after she arrived (Royal Frankish Annals ARF a.818, Kurze 1895 p.148)
The emperor passes Rouen, Amiens and Cambrai and reaches Heristal; envoys of Sico, duke of Beneventum, come with gifts to explain the killing of Grimoald, as do envoys of the Abodrites, the Bornas (Guduscan), the Timocians, and Riudewit of Lower Pannonia (Royal Frankish Annals ARF a.818, Kurze 1895 p.149)