King of Tara (427/8–462/3) who was converted to Christianity by St Patrick. A son of Niall Noígiallach [of the Nine Hostages], he is the earliest king of Ireland whose dates can be known with reasonable accuracy. When he was told that he would die between Ériu [Ireland] and Alba [Scotland], he refused to go to sea. When he was killed fighting the Lagin he was between two hills named Ére and Alba in the plain of the Liffey.
See Gearóid S. MacEoin, ‘The Mysterious Death of Loegaire mac Néill’, Studia Hibernica, 8 (1968), 21–48.