Three Letters from the Companion of the Bulgars - St. Rupert of Juvavum - Bog

This is a collection of otherwise anonymous letters regarding the activity of missionary behavior on the Frankish frontier. The identity of 'Bulgars' here is mistaken for the Avars, who were the dominant pagan military force of the 7th century. This is rare insight into the affairs of the Frankish court into their international affairs.