AD 808

Year 808 was a leap year starting on Saturday of the Julian calendar, the 808th year of the Common Era and Anno Domini designations, the 808th year of the 1st millennium, the 8th year of the 9th century, and the 9th year of the 800s decade.

Events

King Godfred of the Danes forms an alliance with the Wiltzi and other Wendic tribes, against the pagan but pro-Frankish Abodrites. Godfred builds earthworks across the isthmus of Schleswig-Holstein, separating Jutland from the northern extent of the Frankish Empire.
Viking Age: First Viking raid, by Danes against the Baltic coast. Godfred destroys the Slav settlement of Reric, used as a strategic trade route. The population is displaced or abducted, to Hedeby.
Emperor Charlemagne gives orders to construct two new forts on the Elbe River, garrisoning them against future Slav incursions.
In Gharb al-Andalus, Hazim ibn Wahb leads a rebellion against the Emirate of Córdoba.

Exiled king Eardwulf of Northumbria is able to return to his kingdom, with the support of Charlemagne and Pope Leo III. He ousts the usurper, King Ælfwald II.
Cadell ap Brochfael, king of Powys, dies after a 35-year reign, and is succeeded by his son Cyngen ap Cadell.