Locally, the Howe and the circles certainly form one group. No such tumuli, and no such circles exist in other parts of the islands, and the spot is so inhospitable, so far from any of the centres of population in the island, that it is difficult to conceive why it should have been chosen, unless from the accident of being the scene of some important events. If Havard was slain here, which there seems no reason for doubting, nothing seems more probable than that one of his surviving brothers, Liotr or Laudver, should have erected a tumulus over his grave, meaning it also to be a sepulchre for themselves. On the other hand, it is extremely unlikely that the six or seven other tumuli which are admitted to be of Scandinavian origin should have gathered round the Ring of Brogar if it had been a Pagan fane of the despised Celts, who preceded them in the possession of the island. It cannot be necessary here to go over the questions again, whether a few widely spaced stones stuck up around a circle one hundred metres in diameter was or was not a temple. It is just such a monument as 1000 victorious soldiers could set up in a week. It is such as the inhabitants of the district could not set up in years, and would not attempt, because, when done, it would have been absolutely useless to them for any purpose either civil or religious; and if it is not, as before said, a ring in which those who fell in battle were buried, I know not what it is. The chiefs, in this case, would be buried in the conoid barrows close around, the Jarl in the neighbouring howe. As Stennis is mentioned in the Sagas that give an account of Havard's death, it probably existed there, and was called by the simple Scandinavian name which the Northmen gave to all this class of stone monuments. None, so far as I know, have retained a Celtic denomination. Assuming it to be earlier, it still can hardly be carried back beyond the year 800. The earliest date of the appearance of the Northmen in modern times is in the year 793 in the 'Irish Annals,' where mention is made of a "vastatio omnium insularum a Gentibus."[291] In 802, and again in 818, they harried Iona,[292] and from that time forward seem constantly to have conducted piratical expeditions along these coasts, until they ended by formally occupying the Orkneys under Harold Harfagar. Though smaller in diameter, Stennis has a grander and a more ancient look than Brogar, and may even be a century or two older, and be a monument of some chief who fell here in some earlier fight. That it is sepulchral can hardly be a matter of doubt from the dolmen inside its ring. Connected with the circle at Stennis is the holed stone[293] alluded to above, which seems to be a most distinct and positive testimony to the nationality of this group of monuments.