116. Of THESSALONICA (1). Joannes, archbishop of Thessalonica, was a stout defender of the orthodox faith against the Monothelites of the seventh century. He attended as papal legate the third Constantinopolitan (sixth oecumenical) council (A. D. 680), and in that character subscribed the Acta of the council. (Concilia, vol. vi. col. 1058, ed. Labbe; vol. iii. col. 1425, ed. Hardouin; vol. xi. col. 639, ed. Mansi.) The time of his death is altogether uncertain.
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890