Other correspondence, possibly dating to about 1224, between Henry and his sister, Joan, Queen of Scotland, reveals that Hákon Hákonarson, King of Norway was rumoured to have been planning a naval expedition west-over-sea. Although Joan's letter to Henry places this campaign in the context of Hugh's threat to English-aligned interests in Ireland, it may be that Hákon's attention was focused upon the escalating situation in the Isles. One possibility is that Joan's letter is evidence that Óláfr was thought to have appealed to Hákon for support against Rǫgnvaldr.