Early Christianity in Ireland

Christian high cross with Celtic cross
wikimedia

Using the same method as in previous posts I quote here part of a wikipedia article that nicely summarizes the matter of interest here, the arrival of Christianity to the Celtic speaking world.

By the early fifth century the religion had spread to Ireland, which had never been part of the Roman Empire. The highly successful 5th-century mission of Saint Patrick established churches in conjunction with civitates like his own in Armagh; small enclosures in which groups of Christians, often of both sexes and including the married, lived together, served in various roles and ministered to the local population.

Irish society had no history of literacy until the introduction of Christianity, yet within a few generations of the arrival of the first missionaries the monastic and clerical class of the isle had become fully integrated with the culture of Latin letters. Besides Latin, Irish ecclesiastics developed a written form of Old Irish.

During the late 5th and 6th centuries true monasteries became the most important centres: in Patrick's own see of Armagh the change seems to have happened before the end of the 5th century, thereafter the bishop was the abbot also. Finnian of Clonard is said to have trained the Twelve Apostles of Ireland at Clonard Abbey.

In the sixth and seventh centuries, Irish monks established monastic institutions in parts of modern-day Scotland (especially Columba, also known as Colmcille or, in Old Irish, Colum Cille), and on the continent, particularly in Gaul (especially Columbanus). Monks from Iona under St. Aidan founded the See of Lindisfarne in Anglo-Saxon Northumbria in 635, whence Celtic practice heavily influenced northern England.

The achievements of insular art, in illuminated manuscripts like the Book of Kells, high crosses, and metalwork like the Ardagh Chalice remain very well known, and in the case of manuscript decoration had a profound influence on Western medieval art. The manuscripts were certainly produced by and for monasteries, and the evidence suggests that metalwork was produced in both monastic and royal workshops, perhaps as well as secular commercial ones.

Irish monks also founded monasteries across the continent, exerting influence greater than many more ancient continental centres. The first issuance of a papal privilege granting a monastery freedom from episcopal oversight was that of Pope Honorius I to Bobbio Abbey, one of Columbanus's institutions.
Read the entire article here

The idea in this summary is that Christianity may have entered Ireland - which never was under Roman occupation - during the fifth century from Britain and that it began with the mission of Saint Patrick (387-460). The text emphasizes the importance of Irish monks later on as Jesus Christ reached with them Scotland and continental Europe.