Theophanes the Confessor

Theophanes the Confessor (Greek: Θεοφάνης Ὁμολογητής) or Theophanes of the Great Field (Greek: Θεοφάνης τοῦ Μεγάλου Ἄγρου; c. 759 – 817 or 818) was a member of the Byzantine aristocracy who became a monk and chronicler. He served in the court of Emperor Leo IV the Khazar before taking up the religious life. Theophanes attended the Second Council of Nicaea in 787 and resisted the iconoclasm of Leo V the Armenian, for which he was imprisoned. He died shortly after his release.

Theophanes the Confessor, venerated on 12 March in both the Catholic Church and the Eastern Orthodox Church, should not be confused with Theophanes of Nicaea, whose feast is commemorated on 11 October.

Notable works: Chronicle of Theophanes

Source: Wikipedia — https://en.wikipedia.org/wiki/Theophanes_the_Confessor