784

Year 784 was a leap year starting on Thursday of the Julian calendar, the 784th year of the Common Era and Anno Domini designations, the 784th year of the 1st millennium, the 84th year of the 8th century, and the 5th year of the 780s decade. The denomination 784 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

Saxon Wars: King Charlemagne begins a campaign in northern Saxony. He ravages Eastphalian territory as far as the Elbe River, while his son, Charles the Younger, defeats a Saxon force in the Lippe Valley. Bad weather hinders Charlemagne's winter campaign in southern Saxony.
Winter - Charlemagne returns to Eresburg and builds a church, probably on the site of the Irminsul. Frankish forces based at Eresburg attack rebel Saxon settlements, and take control of the roads. Charlemagne himself takes part in some of these raids.
Arabian Empire
Abd al-Rahman I, Muslim emir of Córdoba, begins the construction of the Prayer Hall of the Great Mosque of Córdoba. He uses the mosque as an adjunct to his palace, and names it in honour of his wife.
Asia
The Japanese begin a war against the Ainu, in the north, on the main island of Honshu. Emperor Kanmu wishes to be free from the influence of the Buddhist monasteries around Nara, and moves the capital to Nagaoka, ending the Nara period.
Nagaoka-kyō becomes the Japanese imperial capital.
Central America
February 4 - Itzamnaaj K'awiil, brother of Bat K'awiil and the son of K'ahk' Ukalaw Chan Chaak becomes the new ruler of the Mayan city state of Naranjo in Guatemala and reigns until his death in 810.
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