"Symbatios (Greek: Συμβάτιος, from the Armenian Smbat), variously also Sabbatios (Σαββάτιος) or Sambates (Σαμβάτης) in some sources, was the eldest son of the Byzantine emperor Leo ...
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V the Armenian (r. 813–820). Soon after the coronation of his father, he was crowned co-emperor and renamed Constantine (Κωνσταντῖνος). He reigned nominally along with his father until the latter´s deposition in 820, after which he was exiled to Prote, one of the Princes Islands, as a monk." - (en.wikipedia.org 12.12.2019)