By place Byzantine Empire •
Byzantine-Arab War: Emperor
Theophilos signs an
armistice for peace with the
Abbasid Caliphate. He offers Caliph
Al-Ma'mun 100,000 gold
dinars, in return for 7,000
Byzantine prisoners.
Europe •
June –
Lothair I, eldest son of Emperor
Louis the Pious, joins the rebellion of his brothers
Pepin I and
Louis the German, with the assistance of Archbishop
Ebbo. Louis is forced to abdicate, on the
plains of Rothfield (near
Colmar). •
Mojmir I, Moravian duke, expels Prince
Pribina from his homeland (western part of modern
Slovakia). He unifies
Great Moravia and becomes the first known ruler of the Moravian
Slavs, who founds the
House of Mojmir (approximate date). •
Galindo Aznárez I, Frankish count, usurps the
Catalan counties (
pagi) of
Pallars and
Ribagorza, in the
Spanish March (modern
Spain), a
buffer zone between the
Pyrenees and the
Ebro River.
Abbasid Caliphate (r. 813–833) of the Abbasid dynasty •
August 7 – Caliph
Al-Ma'mun dies after a 20-year reign. He is succeeded two days later by his half-brother
al-Mu'tasim, as ruler of the
Abbasid Caliphate. •
Ibn Hisham, Muslim historian, collects oral traditions that form the basis for the biography of the
Islamic prophet Muhammad.
Japan •
Emperor Junna abdicates the
throne, after a 10-year reign. He is succeeded by his nephew
Nimmyō, as the 54th
emperor of Japan. == Births ==