At this time, Christianization by the missionaries Liudger and Willehad started; one part of East Frisia became a part of the diocese of Bremen, the other the diocese of Münster.
Sel ajal algas kristianiseerimine misjonäride Liudgeri ja Willehadi poolt; üks osa Ida-Friisimaast sai Bremeni piiskopkonna osaks, teine Münsteri piiskopkonna osaks.