Annals of Clonmacnoise, Denis Murphy, The Annals of Clonmacnoise. Royal Society of Antiquaries of Ireland. Dublin, 1896. Dumville, D.N. "St Cathróe of Metz and the hagiography of exoticism." In Studies in Irish Hagiography. Saints and scholars, ed. John Carey, Máire Herbert and Pádraig Ó Riain. Dublin, 2001. 172–88. The following is based on 'Wulfstan 14, fl. 931–956', Prosopography of Anglo-Saxon England. Accessed: 6 February 2009.

Historia regum (6th section) AD 952, ed. Arnold, vol. 2, p. 94: 'defecerunt hic reges Northanhymbrorum; et deinceps ipsa provincia administrata est per comites'; Historia regum (section 6) AD 953, ed. Arnold, vol. 2, p. 94: 'Comes Osulf suscepit comitatum Northanhymbrorum'. Anglo-Saxon Chronicle (MSS D, E) 946. Cf: William of Malmesbury, Gesta regum II ch. 146: "The Northumbrians and Scots were easily brought to swear an oath of fealty to him [Eadred]".Annals of Ulster, ed. and tr. Seán Mac Airt and Gearóid Mac Niocaill, The Annals of Ulster (to AD 1131). Dublin, 1983. Eyvindr Finnsson skáldaspillir, Lausavísur, ed. Russel Poole. At Skaldic Poetry of the Scandinavian Middle Ages.

Henry of Huntingdon, Historia Anglorum, ed. and tr. D.E. Greenway, Henry Archdeacon of Huntingdon. Historia Anglorum. The History of the English People. OMT. Oxford, 1996. The Norse sagas differ in the way they treat the manner and route by which Eric first came to Britain after he was forced out of Norway. The synoptic histories offer the most concise accounts. Theodoricus goes straight for Eric's arrival in England, his welcome there by King Æthelstan, his brief rule and his death soon afterwards. Similarly, the Historia Norwegiæ makes him flee directly to England, where he was received by his half-brother Haakon, baptised and given charge of Northumbria by Æthelstan. When Eric's rule became intolerable, he was driven out and slain on an expedition in Spain. Ágrip tells that he came to Denmark first. According to Historia Norwegiæ, it would have been his wife's native country and hence a power base where he might have expected to muster some support, but the text makes no such claims. [50]Adam of Bremen, Gesta Hammaburgensis Ecclesiae Pontificum II xxv (§ 22), tr. Francis J. Tschan, History of the Archbishops of Hamburg-Bremen. New York, 1959. pp 70–1. Annals of the Four Masters, ed. and tr. John O’Donovan, Annála Rioghachta Éireann. Annals of the Kingdom of Ireland by the Four Masters. 7 vols.: vol. 2. Royal Irish Academy. Dublin, 1848–51.

Heimskringla (Haraldar saga) ch. 24, 32 (which adds that Eric was entrusted to Thórir after his mother's death); Egils saga ch. 36; Óláfs saga Tryggvasonar en mesta ch. 2.Chronicle of the Kings of Alba, ed. W.F. Skene. Chronicles of the Picts and Scots: And Other Memorials of Scottish History. Edinburgh, 1867. 8–10. It is when Eric gains the kingship in Northumbria that he finally steps more firmly into the historical limelight, even though the sources provide only scanty detail and present notorious problems of their own. The historical sources– e.g., versions A-F of the Anglo-Saxon Chronicle, Historia regum and Roger of Wendover's Historia Anglorum– tend to be reticent and the chronology is confused. However, the best chronological guideline appears to be that offered by the Worcester Chronicle, i.e., the D-text of the Anglo-Saxon Chronicle. [54] Edith Marold, " Eiríksmál". In Medieval Scandinavia. An Encyclopedia, ed. Phillip Pulsiano and Kirsten Wolf. New York: Garland, 1993. pp. 161–62. Determining the date and length of Eric's reign (before and after his father's death) is a challenging and perhaps impossible task based on the confused chronology of our late sources. [49] It is also unfortunate that no contemporary or even near contemporary record survives for Eric's short-lived rule in Norway, if it is historical at all.