Despotate of the Morea
He was the brother of Mark Eugenikos, and like him an ardent opponent of the Union of the Churches. Originally a notary and "nomophylax" at the Patriarchate of Constantinople, his opposition to the Union saw him exiled to the Despotate of the Morea, where he died. John participated briefly in the Council of Florence that ratified the Union, and also travelled to Trebizond and Mesembria.