 The chronicle records that in 1228, while Óláfr and his chiefs were away from Mann, the island was attacked and devastated by Alan, his brother Thomas, Earl of Atholl (d. 1231), and Rögnvaldr. It was only when Alan left with most of his force that Óláfr was able to regain control of the island. Rögnvaldr sailed from Galloway in the winter of the same year, landed on Mann, and burnt all the ships of Óláfr and his chiefs. The chronicle states that Rögnvaldr stayed at Ronaldsway for forty days; and that he won over the hearts of the southern inhabitants of the island. Óláfr and his forces arrived at Tynwald on 14 February 1229, where they attacked Rögnvaldr and his men. The chronicle claims that Rögnvaldr was treacherously killed by his own men, without the prior knowledge of Óláfr, and also notes that Óláfr never avenged his half-brother's death.
