Three chapters (Christological controversy)

The Three-Chapter Controversy, a phase in the Chalcedonian controversy, was an attempt to reconcile the non-Chalcedonians of Syria and Egypt with Chalcedonian Christianity, following the failure of the Henotikon. The Three Chapters (τρία κεφάλαια, tría kephálaia) that Emperor Justinian I anathematized were: The person and writings of Theodore of Mopsuestia Certain writings of Theodoret of Cyrus The letter of Ibas of Edessa to Maris