On 14 February, the festival of St Valentine, the chronicle records that Óláfr's forces launched an attack upon Rǫgnvaldr at Tynwald, where Rǫgnvaldr's troops were routed and he himself was slain. Whilst Rǫgnvaldr's fall is laconically corroborated by the Icelandic annals, other sources appear to suggest that his death was due to treachery. The fourteenth-century "Chronicle of Lanercost", for example, states that Rǫgnvaldr "fell a victim to the arms of the wicked"; whilst the "Chronicle of Mann" states that, although Óláfr grieved at his half-brother's death, he never exacted vengeance upon his killers. The chronicle states that the monks of Rushen took Rǫgnvaldr's body to Furness, where he was buried at the abbey in a place that he had chosen beforehand. A particular sandstone effigy of an armed, mail-clad warrior, found in the north aisle of the abbey, has been associated with Rǫgnvaldr since the first half of the nineteenth century. Such an association is nevertheless dubious at best.