The Deicolæ were organised in 747 as an order of Secular Canons with the object of bringing the secular clergy into a cœnobitical life, so as to help to counteract the then prevailing tendency to the eremitical mode of living. The nature of the structures erected under the latter form of religious observance is well illustrated in the cells and oratories already alluded to, which were erected in such numbers on the lonely and deserted islands on the West Coasts of Ireland and Scotland. The advent of the Roman emissaries in Scotland is embodied in several mythical legends. Such is the story of the arrival of St. Boniface with a complete following of persons representing all the offices of the Roman service, and his favourable reception by King Nectan indicates the goodwill with which they were welcomed.[31] The dedications of churches to St. Peter, superseding the dedication to the ancient native Saints, further mark the change from Iona to Rome. The assimilation of the Church to the Roman system, and the introduction of the secular clergy, led in Scotland, as it had done in Northumbria, to the secularisation of the monasteries. Through the operation of the Celtic rules of succession they fell into the hands of laymen, who retained the title of abbot, and with it the possession of the monastic lands, but without any pretence to clerical office.[32] The old Celtic system of monasticism thus perished, first, from internal decay and change to the eremitical system; and, second, from its being gradually superseded by the introduction of the secular clergy on the Roman system. Meanwhile at Iona, and in all the Western Islands and coasts, a new enemy to the Columban establishments sprung up. In 794 the Northern Rovers made their first appearance, and during many succeeding years the monastery of Iona was frequently attacked and pillaged, the monks being slain or driven to seek safety in Ireland. The connection between Ireland and Scotland was thus almost entirely severed during the ninth century, and the Columbans having (as above stated) been expelled from the Pictish kingdom, the previous active relations between the Church in the two countries was for the time entirely brought to a close.