a close alliance with Charles Martel, and attacks the Bavarian castles on the River Adige, maintaining strategic control of the Alpine passes in the Italian Alps (approximate date). Britain King Coenred of Northumbria dies after a 2-year reign. The throne is seized by Osric, probably a younger brother, or half-brother, of the late king Osred I. Former queen Cuthburh of Northumbria, abbess of Wimborne, dies at her abbey and is buried there (approximate date). By topic Religion The Wessex-born missionary Boniface sets out for Frisia a second time. He travels to Rome, where Pope Gregory II sends him on a mission to convert the Saxons in Lower Saxony (modern-day Germany). Hugh of Champagne, cousin of Charles Martel, enters the monastery of Jumièges (Normandy), and embraces the religious life as abbot. Births Constantine V, Byzantine emperor (d. 775) Kōken, empress of Japan (d. 770) Niall Frossach, High King of Ireland (d. 778) Ōtomo no Yakamochi, Japanese statesman and poet, Shōgun (d. 785) Deaths Coenred, king of Northumbria Cuthburh, Anglo-Saxon abbess (approximate date) Plectrude, Neustrian regent References