At roughly this period, in 1209, the fifteenth- to sixteenth-century "Annals of Ulster" reports that the sons of Ragnall mac Somairle attacked Skye and slaughtered many of the Skyemen. It is unknown if this invasion of Rǫgnvaldr's realm was any way related to the slaying of Ragnall's brother, Áengus mac Somairle, and the latter's three sons, in the following year. What is certain, however, is that these, and other records concerning the Meic Somairle, reveal that the Crovan dynasty was not alone in introducing instability into the Isles. In fact, the elimination of Áengus and his sons appears to have had serious repercussions on not only the Meic Somairle succession, but Rǫgnvaldr's kingship in the Isles.