 Procopius provides the primary source for the history of Justinian 's reign . The Syriac chronicle of John of Ephesus , which does not survive , was used as a source for later chronicles , contributing many additional details of value . Both historians became very bitter towards Justinian and his empress , Theodora . Other sources include the histories of Agathias , Menander Protector , John Malalas , the Paschal Chronicle , the chronicles of Marcellinus Comes and Victor of <unk> . Justinian is considered a saint among Eastern Orthodox Christians , and is also remembered by some in the Lutheran Church on 14 November . 
