The authors provide us with the Syriac text together with a translation of part of the controversy between the patriarchs Peter and Damian from the end of the sixth century, over alleged tritheism with which Peter of Callinicum was charged by his Sobellianizing opponents. With the publication and translation of this dossier we have a window opened on the debates that developed between Chalcedonian and non-Chalcedonian churchmen and theologians...