Before 11 Jan 1041 Bishop Æthelric was elected Bishop of Durham.
John of Worcester. 01 May 1048. There was a great earthquake on Sunday the first of May, at Worcester [Map], Wick, Derby [Map], and many other places. Many districts of England were visited with a mortality among men and cattle; and a fire in the air, commonly called wild-fire, burnt many vills and cornfields in Derbyshire and some other districts. Edmund, bishop of Lindisfarne, died at Gloucester, but was carried by his people to Durham, and buried there. Edred succeeded him, but being struck by the divine vengeance, Ethelric, a monk of Peterborough, was appointed in his stead.
John of Worcester. 16 Jun 1056. Earl Ethelwin (age 63), that is Odda, [Earl of Devon] a the friend of the churches, the solace of the poor, the protector of widows and orphans, the enemy of oppression, the shield of virginity, died at Deerhurst on the second of the calends of September [31st August], having been made a monk by Aldred, bishop of Worcester, before his death; but he lies in the abbey of Pershore [Map], where he was buried with great pomp. Æthelric, bishop of Durham, voluntarily resigned his see and retired to his monastery of Peterborough, where he had been brought up and made a monk; and there he lived twelve years, having been succeeded in his bishopric by his brother, Ægelwin, a monk of the same abbey.
Anglo-Saxon Chronicle. 1072. This year died Bishop Aylric. He had been invested Bishop of York; but that see was unjustly taken from him, and he then had the bishopric of Durham given him; which he held as long as he chose, but resigned it afterwards, and retired to Peterborough minster [Map]; where he abode twelve years. After that King William (age 44) won England, then took he him from Peterborough, and sent him to Westminster; where he died on the ides of October, and he is there buried, within the minster, in the porch of St. Nicholas.
John of Worcester. After 15 Aug 1072. After the Assumption of St. Mary [15th August], William (age 44), king of England, attended by Edric the Forester, made an expedition into Scotland with a naval force and an army of cavalry, and reduced it under his own dominion; and Malcolm (age 41), king of Scots, met him at a place called Abernethy, and did him homage. Ethelric, formerly bishop of Durham, died at Westminster, where king William (age 44) had sent him into confinement, on Monday, the ides [the 15th] of October. Walchere, a native of Lorraine, succeeded Ethelwine in the see of Durham.
On 15 Oct 1072 Bishop Æthelric died.