It is not until the middle of the 5th century of the Christian era that the early chronicles begin to cast occasionally a feeble and uncertain light upon the history of the northern isles. It is stated in the “Historia Britonum” of Nennius that the Saxon chiefs Ochtha and Ebissa, who came over with “forty keels” in the year 449, laid waste the Orkney Islands, and seized a great many regions beyond the Frisic Sea.[2] At that time, and for a long period previously (according to Nennius), the Picts had been in possession of the Orkneys. Whatever value may be attached to these statements as referring to events which took place 400 years before the author’s own time, there can be no reason for discrediting his testimony when he says that the Picts continued in possession of the Orkneys in his day.[3] Adamnan, in his Life of St. Columba, mentions that the saint being on a visit to Bruide Mac Meilcon, king of the Northern Picts, at his stronghold on the river Ness, requested the king to recommend to the _reguli_ of the Orkneys (one of whom was then present, and whose hostages were then in the king’s hands) that Cormac and the clerics who had accompanied him on a missionary voyage to the Orkneys should receive no harm; and it is added that this was the means of saving them from a violent death. But if the authority and influence of the king of the Northern Picts extended to these islands in the reign of Bruide, it does not seem to have been effectual in protecting them from foreign invasion. Bruide Mac Meilcon died in 584, and some time before his death the new and rising power of the Dalriadic kings had made itself felt as far as the Orkneys. In the Annals of Ulster there is a notice under the year 580 of an expedition against the Orkneys by Aedan, son of Gabran, seventh king of the Dalriad Scots, who, coming over from Ireland (then called Scotia) about the year 503, had established themselves in Argyle and the Western Highlands, and founded the kingdom of Dalriada. From the date of Aedan’s expedition in 580 we have no mention of the islands in the native chronicles for a whole century, and the next entry, which occurs under the year 682, gives colour to the supposition that they may have been under Dalriadic rule in the interval. The record in 682 is simply, that the Orkneys were wasted by Bruide Mac Bile, the king of the Northern Picts, and apparently brought once more under the rule of the Northern Pictish kings. II. EARLY CHRISTIANITY OF THE ISLANDS.