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'''Leo VI''' was co-Emperor of Rome from [[January 6 January ]], 870 until the death of his father [[Basil I]] on [[July 30 July ]], 886, he then ruled as sole Emperor until his death on [[May 11 May ]], 912. Leo VI was very active in codification of Roman law especially in the area of [[Roman marriage law]]. His main "contributions" to Church history were the dismissal of St. [[Photius the Great]] as [[Patriarch]] of Constantinople and instigating the [[Tetragamy schism]].