Letters on the Calculation of Easter

This work consists of two letters, addressed to Bishop Petronius by Dionysius Exiguus, a Dacian monk. It outlines the calculation of the Paschal feast based on the venerable tradition established by the Council of Nicaea. It asserts the importance of the nineteen-year cycle (Enneacaidecaeteris) in determining the dates of the Paschal feast, which some have altered due to ignorance or arrogance. The text highlights the continuity of this tradition through notable figures like Athanasius, Theophilus, and Cyril, and introduces a new cycle of ninety-five years, emphasizing the need for a stable foundation in the computation of the feast despite some inconsistencies.