King Louis the Pious is crowned emperor of the Holy Roman Empire by the Pope.

Louis the Pious, also called the Fair and the Debonaire, was King of the Franks and co-emperor with his father, Charlemagne, from 813. He was also King of Aquitaine from 781. As the only surviving son of Charlemagne and Hildegard, he became the sole ruler of the Franks after his father's death in 814, a position that he held until his death except from November 833 to March 834, when he was deposed.

October 5 is the 278th day of the year in the Gregorian calendar; 87 days remain until the end of the year.