Pope Gregory II
In 716, Boniface joined Willibrord in Utrecht. Their efforts were frustrated by the war between Charles Martel and Redbad, King of the Frisians. Willibrord fled to the abbey he had founded in Echternach, while Boniface returned to the Benedictine monastery at Nhutscelle. The following year he traveled to Rome, where he was commissioned by Pope Gregory II as a traveling missionary bishop for Germania.