AD 777

Year 777 was a common year starting on Wednesday of the Julian calendar, the 777th year of the Common Era and Anno Domini designations, the 777th year of the 1st millennium, the 77th year of the 8th century, and the 8th year of the 770s decade. The denomination 777 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 spends Easter in Nijmegen, and leads a large Frankish army to Paderborn, where a general assembly of Carolingian and Saxon leaders had been summoned. Saxon lands are integrated into the Frankish Kingdom, and divided into missionary parishes. Duke Widukind and his followers flee to King Sigfred of Denmark, seeking refuge and support.
Abbasid–Carolingian alliance: Charlemagne receives a request for support from pro-Abbasid rulers in the eastern thughur, or military frontier zone of the Emirate of Córdoba. Several powerful officials and noblemen in northeastern Iberia, such as the governors of Barcelona and Zaragoza, seek to rise up against the Umayyad emir Abd al-Rahman I.
Africa
Abd al-Rahman ibn Rustam is recognized as imam of the Ibadis, in Maghreb.
By topic

Duke Tassilo III of Bavaria founds Kremsmünster Abbey. During this period, the Tassilo Chalice is possibly donated by Luitpirga, wife of Tassilo.