The precise impetus behind Rǫgnvaldr's submission is uncertain, although it may well have been related to the threat of ever-strengthening Norwegian kingship. Certainly Hákon had only acceded to the Norwegian kingship two years previously, and by the early part of his reign the civil warring within his realm began to wane. In his submission, Rǫgnvaldr stated that the kingdom was his by hereditary right, and that he held it without any obligation to anyone. This contradicts the statement by "Bǫglunga sǫgur", which declare that he and his son swore loyalty to Hákon and took his kingdom in fief of the latter. The submission, therefore, may have been a means by which Rǫgnvaldr attempted to release himself from Norwegian overlordship. On 23 September 1220, Henry III commanded that the Irish justiciary and baronage should lend assistance to Rǫgnvaldr against his enemies. Furthermore, a royal order addressed to Henry III's administrators in Ireland, dated 4 November 1220, commanded Henry III's men to render military aid to Rǫgnvaldr, since the latter had provided evidence that Hákon was plotting to invade his island-kingdom. Not long after this enlistment of English support, the "Annals of Loch Cé" and the seventeenth-century "Annals of the Four Masters" report the death of Diarmait Ua Conchobair at the hands of Thomas fitz Roland in 1221. These sources state that Diarmait was in the process of assembling a fleet in the Isles to reclaim the kingship of Connacht. There is a possibility, however, that his actions in the Isles were connected to the Norwegian threat feared by Rǫgnvaldr. In fact, Diarmait's kinsman, Áed na nGall Ua Conchobair, appears to have attempted the procurement of Hákon's assistance at a later date.