5 events the sources record for this year, grouped by region.
What happened
Japan (2)
The conspiracy of Hikami no Kawatsugu, governor of Inaba, is discovered; when he flees, the Three Barriers are guarded and searched. (Shoku Nihongi (Continued Chronicles of Japan) 續日本紀 卷第37 「閏正月甲子。因幡國守」)
In early summer Charles crosses the Rhine at Cologne and camps for several days at the source of the Lippe, where he holds an assembly. He receives envoys of Sigifrid, king of Denmark, and of the Hun leaders, the kagan and Igurus (Royal Frankish Annals ARF(Einhard판) a.782, Kurze 1895 p.59)
Frankish envoys, attacked by the Saxons gathered at Widukind's instigation, are defeated on the bank of the Weser beside Mount Süntel; two envoys (Adalgisus and Geilo), four counts and about twenty nobles die in battle (Royal Frankish Annals ARF(Einhard판) a.782, Kurze 1895 p.63)
The king demands that the Saxon leaders hand over Widukind, but they cannot; so about 4,000 of the participants are beheaded in one day at Verden on the Aller River (the OCR figure 'quattuor milia' in the original is uncertain) (Royal Frankish Annals ARF(Einhard판) a.782, Kurze 1895 p.65)