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The Irish monks wore a tonsure different from the Roman monks; the Irish had their foreheads shaved from ear to ear, with long hair trailing down their back, while the Roman custom was to shave the crown of the head. The Irish claimed that their tonsure came from Saint John the Evangelist whereas the Romans claimed to have inherited their tonsure from Saint Peter. The tonsure, however, did not cause nearly as much problems as the date of Easter. From the beginning of Christianity the Church celebrated Easter at the same time the Jews observed Passover, on 14 Nisan, at the first full moon after the Spring Equinox. Following the Council of Nicaea in 325, the Roman church placed the equinox on March 21, while the Celtic churches insisted upon March 25 as the date of the Equinox. And so some years Easter in the two rites coincided but other years it did not. From The Freelance History Writer:
The Celts understood that the tradition they followed was that taught by the apostle John and they calculated Easter day as falling between 14 Nisan and 20 Nisan – i.e. When the 14 Nisan (the Passover) fell on a Sunday, they celebrated it on that day. But if it fell on the day after (on Monday) then the Easter celebration would fall on the following Sunday (20 Nisan), etc. The Rome loyalists claimed the authority of the apostle Peter, and calculated Easter Day as falling between 15 Nisan and 21 Nisan.
So when the date of 15 Nisan through to the 20 Nisan fell on a Sunday, and the full moon had fallen after March 25th, both Celtic and Roman Christians would celebrate Easter on the same day. It was when the Celts celebrated on 14 Nisan itself on Sunday that one main difference came, as the Rome loyalists then celebrated Easter a week later on 21 Nisan instead. This explains the situation described by the Venerable Bede: “Thus it is said to have happened in those times that Easter was twice kept in one year; and that when the king having ended the time of fasting, kept his Easter, the queen and her followers were still fasting, and celebrating Palm Sunday”. In that particular year 14 Nisan had fallen on a Sunday. (Read more.)
Members of the same family, depending on whether they followed the Celtic or Roman practice, would keep Lent and Easter at different times. This caused no end of inconvenience for those who had to cook the meals, since Lenten fasting in those days was very strict, with no meat, milk or eggs allowed.
According to Edmund Curtis in A History of Ireland (1936):
Under the papal authority the Paschal date had been fixed for the Church by Victorius in 457, but the Celtic churches adhered to the Paschal term as fixed by Anatolius in the third century. As a practical result the Irish were found keeping Easter from the fourteenth to the twentieth of the lunar month and the Continental church between the sixteenth and the twenty-second. On this matter of controversy many letters had passed between the Irish leaders and Rome. Popes Honorius and John IV had urged the Irish to conform and had been answered by Cummian and by Columbanus. The latter, writing to Saint Gregory the Great, boldly maintained the Irish position over Easter, but conceded to the Holy See a primacy of honor and a measure of supreme authority, adding, 'it is known to all that our Savior gave Saint Peter the keys of the kingdom of Heaven, and that Rome is the principal seat of the orthodox faith. By the middle of the seventh century southern Ireland had accepted the [Roman] Easter and only northern Ireland and Iona, strong in the name and memory of Columba, stood out. (pp.15-16)
Iona finally gave in around 716 and northern Ireland followed suit. After the Synod at Whitby had brought most of northern Britain into the Roman calculation of Easter, the Celtic monks in Scotland and northern England had withdrawn to Iona. What intrigues me about this controversy is that there were great saints who vehemently disagreed with each other on ecclesiastical matters.
Dun na Gael