"For after the their baptism the Croats made a covenant, confirmed with their own hands and by oaths sure and binding in the name of St. Peter the apostle, that never would they go upon foreign country and make war on it, but rather would live at peace with all who where wiling to do so; and they recived from the same pope of Rome a benediction on this effect, that if any other foreigners should come against the country of these same Croats and bring war upon it, then might God fight for the Croats and protect them, and Peter the disciple of Christ give them victories."
Constantine Porphyrogenitus >>De Administrando Imperio<<