Ímar is first mentioned in contemporary Irish annals in 857, four years after his brother Amlaíb Conung is recorded as arriving in Ireland [REF].
The first mention of Ímar in Irish annals in 857 concerns a war fought between Ímar and Amlaíb Conung against Máel Sechnaill, Some sources use the name "Máel Sechnaill" and some use "Máel Sechlainn" to refer to this person [REF].