[7] The bishop, or another churchman named Augustalis in Gaul of the 5th century (possibly the 3rd[8]) was the author of a tract De ratione Paschae, a table or laterculus on calculating the Paschal cycle.
He is referenced in the Carthaginian Computus of 455,[9] preserved in an 8th-century chronographical manuscript in the cathedral library at Lucca.
[13] Augustalis worked with, or is thought sometimes even to have originated, the 84-year Metonic cycle usually associated, like the date of March 25 for Easter, with the Celtic tradition of Christianity in Gaul and the Celtic Islands, including Hibernia (Ireland) and Britannia (Britain).
[15] Although the author of the Carthaginian Computus takes note of Augustalis as a man "of most sainted memory,"[16] he points out several errors in his computations.
[21] Eduard Schwartz criticized the views of Krusch, asserting that the table of Augustalis was never used in Rome and that it represented an "eccentric version" of the 84-year cycle used by the insular Celtic churches.