Some Roman Catholic writers (such as Thomas Cahill) continue to use a system of degrees of martyrdom that was developed in early Christianity.
How The Irish Saved Civilization: The Untold Story of Ireland's Heroic Role from the Fall of Rome to the Rise of Medieval Europe is a non-fiction historical book written by Thomas Cahill.
Thomas Cahill, Sailing the Wine-Dark Sea: Why the Greeks Matter (Nan A. Talese, 2003)
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