Two Brothers United in Witness of Christ

Of these two martyrs, Saint Proto and Saint Hyacinthus, only their names, the place of their burial and the date of their death—September 11, the day on which the Church commemorates them—are known. However, according to ancient sources such as the Depositio Martyrum of Rome and the Gelasian and Gregorian Sacramentaries, their martyrdom is a historically certain event from antiquity as was their widespread veneration.