The Kingdom of the Franks expanded eastward underneath the strongest of the Merovingians and the Carolingian "Mayors of the Palace". The German tribes they encountered were either still pagan or only slightly touched by Christianity. Irish monks and then "Benedictines" from Britain, like St. Boniface, would come to work with the Kingdom of the Franks to become apostles to the unconverted and tepid. Taken from the series: Dr. John Rao, "From Augustine and Chrysostom to the Papal-Frankish Alliance Christianity in the Early Middle Ages (395-752) - 2006 VonHildebrand Institute"