Dionysius Exiguus, and others following him, maintained that the 318 Bishops assembled at the Nicene Council had specified a particular method of determining the date of Easter; subsequent scholarship has refuted this tradition. In any case, 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 8-year cycle originally employed was replaced by (or by the time of) Augustalis's treatise on the measurement of Easter, after which Rome used his 84-year lunisolar calendar cycle until 457. It then switched to an adaptation by Victorius of the Alexandrian rules.