Columbanus (Irish: Columbán, 543 – 21 November 615) was an Irish missionary notable for founding a number of monasteries on the European continent from around 590 in the Frankish and Lombard kingdoms, most notably Luxeuil Abbey in present-day France and Bobbio Abbey in present-day Italy. He is remembered as an exemplar of Irish missionary activity in early medieval Europe.[1]
Columbanus taught a Celtic monastic rule and Celtic penitential practices for those repenting of sins, which emphasised private confession to a priest, followed by penances levied by the priest in reparation for the sins. Columbanus is one of the earliest identifiable Hiberno-Latin writers.[1]
en.wikipedia.org/wiki/Columbanus

Saint Gall, Irish Apostle to Switzerland
(†645)
Saint Gall was soon known in Switzerland as a powerful preacher. He is said to have thrown down images to heathen gods, and exhorted the worshippers of these images to return to the true God. As a result of Gall’s work, practically the whole of Switzerland is thought to have embraced the Christian faith.
When the See of Constance became vacant, the clergy who assembled to elect a new Bishop were unanimously in favour of Saint Gall on account of his superior learning and sanctity. He, however, refused, pleading that the election of a stranger would be contrary to Church law, but proposed his deacon John, who was duly elected and consecrated Bishop.
Some time later, in the year 625, on the death of Eustasius, who was abbott of Luxeuil, a monastery founded by Saint Columbanus, six members of that community, all Irishmen, were sent by the monks to request Saint Gall to undertake the government of the monastery. He definitely refused to quit his life of solitude, and undertake any office of rank which might involve him in the cares of the world. He was then an old man, and probably felt himself unable to cope with the duties of high office.
The Legend of Saint Gall
A legend about Saint Gall in his solitary life has become well known. The story tells how a bear became St. Gall’s sole friend in the closing years of his life, and that the bear used to carry logs to the saint so that he could light his fire. The bear has now become the coat of arms (below, on coin) for the town of St. Gallen in Switzerland, and the bear carrying the logs is depicted on the wall of the great Cathedral there, as it is in the parish church at Carnalea .

Saint Gall died on 16th October in the year 645, at the age of 95, and that date – 16th October – is now honoured in Carnalea parish each year as Saint Gall’s Day.
An assiduous preacher of the Gospel, a skilful trainer of people in the work of evangelisation, and a man of remarkable holiness of his life, Saint Gall left an abiding mark on the country in which he worked. His memory has long been revered in the locality of his labours he became known and honoured as the Apostle of Switzerland.
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Troparion of the Saint, in Tone 8
As a companion of the Great Columban
thou didst travel throughout the lands of the Franks, o father Gall,
thy ascetic life contrasting with that of the worldly prelates whom thou didst encounter.
Open to us, we pray thee, the treasures of sacrifice and struggle,
that we too may attain the joy of eternal salvation
www.oodegr.com/…/Gall_apostle_sw…