Some scholars have suggested "ua Ímair" might not refer to a literal grandson at all, but may instead be a generic term for a descendant of Ímar, or may even indicate an individual of unknown descent. However, according to Downham the fact "ua Ímair" is not seen in the Irish annals after 948 suggests it was solely used for literal grandsons.[87] Downham, Clare (2007). Viking Kings of Britain and Ireland: The Dynasty of Ívarr to A.D. 1014. Edinburgh: Dunedin Academic Press. ISBN978-1-903765-89-0.