Teutonic people occupying the coast lands from the Scheidt to the Ems, related to the Angles and the Saxons, speaking a Low German dialect; mentioned by Tacitus. In the 7th century those in the southwest were subdued by the Franks under Pepin of Heristal. Under the leadership of Radbod, a fanatical pagan, they obtained possession of Frisia (716), forced Saint Willibrord of Echternach and his fellow missionaries to leave, but finally were forced to surrender Western Frisia to keep the peace. Their conquest and Christianization was completed by Charlemagne. Old Frisian literature consists of collections of laws, epics, poems, and sagas.