As per usual, given the various versions of the Hagiography of each saints, there are various versions according to the author and audience in conformity to the desires of the Church or religious orders of the time.
If we look over at Celtic Saints of Sept. 3rd on this day there are seven, including Gregory the Great; and from Catholic online/Angels and Saints we have, among many St. Angus MacNisse and 24 others.
Gregory the Great features in both the Celtic and Roman Canon
St. Gregory the Great, Pope of Rome, (Gregory the Dialogist)
Born in Rome, Italy, c. 540; died there March 12, 604. His major feast day is March 12. The Feast today commemorates the day he was chosen as Bishop of Rome.
The Holy Bible is like a mirror before our mind’s eye. In it we see our inner face. From the Scriptures we can learn our spiritual deformities and beauties. And there too we discover the progress we are making and how far we are from perfection.
Where does one begin to recite the glories of a man who excelled at many things in so many ways? His greatness is emphasised by contrast with the time in which he lived, when everything was in decline. He was prefect of Rome when he wrote:
also known, as St. MacNisse, Bishop of Connor, Dalriada (Macnisius, Aengus McNisse. Macanisius) Died 506-514. Saint MacNisse, a disciple of Saint Olean (Bolcan?)
Ledgends about this saint are unreliable, and according to these Anghus MacNisse was baptised by St. Patrick, and concecrated Bishop by him many years later.
Returning from a pilgrimage to the Holyland and Rome , he founded a church and monastery at Kells, which developed into the Diocese of Connor, of which he is considered the first bishop.
Extravagant miracles seed his record, for instance changing the course of a river for the convenience of his monks and rescuing a child about to be executed for his father’s crime by causing him to be blown by the wind from his executioners into his arms.
From Oremus.org it is given as an illustration of his ( Saint MacNisse’s) holiness that instead of carrying his Gospel book in his satchel as was customary, he bore it on his shoulders “hunched up or on all fours!” ( Source – Oremus, Liturgy of Ireland)