 Whether his friend Eusebius had died, or whether they both occupied the see together, is a matter of much discussion.The question is treated at length in the Bollandists.Around AD 260 Anatolius invented the first Metonic 19-year lunar cycle (which 19-year periodic sequence of dates of the Paschal full moon must not be confused with the Metonic cycle, of which it is an application in the Julian calendar).