Page "Easter" Paragraph 47

In the years following the council, the computational system that was worked out by the church of Alexandria came to be normative.

It took a while for the Alexandrian rules to be adopted throughout Christian Europe, however.

The Church of Rome continued to use an 84-year lunisolar calendar cycle from the late 3rd century until 457.

It then switched to an adaptation by Victorius of Aquitaine of the Alexandrian rules.

Because this Victorian cycle differed from the Alexandrian cycle in the dates of some of the Paschal Full Moons, and because it tried to respect the Roman custom of fixing Easter to the Sunday in the week of the 16th to the 22nd of the lunar month ( rather than the 15th to the 21st as at Alexandria ), by providing alternative " Latin " and " Greek " dates in some years, occasional disagreements from the date of Easter as fixed by Alexandrian rules continued.

The Alexandrian rules were adopted in their entirety in the 6th century.

From this time, therefore, all disputes between Alexandria and Rome as to the correct date for Easter cease, as both churches were using identical tables.