I Gennadius, a presbyter of Marseilles, have written eight books Against all heresies, five books Against Nestorius, ten books Against Eutyches, three books Against Pelagius, also treatises On the Millennium and On the Apocalypse of Saint John, also an epistle On my creed, sent to the blessed Gelasius, bishop of Rome.]
Source: Illustrious Men (Supplement to Jerome) (New Advent)