838

Europe

 * At, beats the Danish and the West Welsh.
 * Stone of Destiny placed at,.
 * is founded on the river.
 * Royal meeting between, and Niall, King of the Southern Uí Neill and Tara at Cluain-Conaire-Tommain, as a result of which the  says Feidlimid becomes

Asia

 * Caliph captures  in.

Religion

 * The convert to . (approximate date)

Births

 * , physician, philosopher, mathematician, and astronomer

Deaths

 * , son of Louis the Pious, King of the Frankish Empire.