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From Olympiads to AD: The complex history of calendars, consuls, and Christian chronology in the ancient world

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From Olympiads to AD: The complex history of calendars, consuls, and Christian chronology in the ancient world
Beginning of Church Year; Ven. Dionysius Exiguus; St. Simeon Stylites (Service of Thanksgiving); 10th Sunday after Pentecost
Holy miscalculation: The entire Christian calendar is based on a sixth-century monk's 'mistake,' Pope says