Nielsen Hayden genealogy
Robert de Mowbray
Bef 1059 - Aft 1125 (> 68 years)-
Name Robert de Mowbray Birth Bef 1059 [1] Gender Male Death Aft 1125 St. Albans Abbey, Hertfordshire, England 
[1] Person ID I3721 Ancestry of PNH, TNH, and others Last Modified 20 Dec 2015
Family Maud de l'Aigle d. Aft 1129 Marriage 1095 [1] Family ID F1856 Group Sheet | Family Chart Last Modified 20 Dec 2015
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Notes - Earl of Northumberland.
"Robert de Mowbray (Montbrai), seigneur of Bazoches, son of Roger de Montbrai, was made Earl upon the retirement of Aubrey [a knight who was previous administrator of Northumberland], probably in 1080 or 1081. According to the chroniclers he governed badly and with great cruelty. He defended his Earldom against an incursion by the Scots under Malcolm in 1091, and in 1093 defeated him at Alnwick, where the Scottish King and his eldest son Edward were killed (13 Nov). In 1095 he rebelled actively against William Rufus, in support of a conspiracy to put on the throne of England Stephen, Count of Aumale, son of the Conqueror's sister Adelaide. Rufus marched north, took the Earl's new fortress at Newcastle and the castle of Tynemouth, and besieged Bamborough, when the Earl had escaped, and where the Countess held out till compelled to surrender by a threat to blind her husband, who had been captured. He was deprived of his Earldom, and imprisoned at Windsor. [...] It is said he was kept in prison for 30 years, till Henry I allowed him to become a monk at St. Albans, where he died. He was a benefactor of St. Stephen's Abbey." [Complete Peerage]
- Earl of Northumberland.
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Sources - [S128] The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant ed. Vicary Gibbs, H. A. Doubleday, Duncan Warrand, Howard de Walden, Geoffrey H. White and R. S. Lea. 2nd edition. 14 volumes (1-13, but volume 12 spanned two books), London, The St. Catherine Press, 1910-1959. Volume 14, "Addenda & Corrigenda," ed. Peter W. Hammond, Gloucestershire, Sutton Publishing, 1998.
- [S128] The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant ed. Vicary Gibbs, H. A. Doubleday, Duncan Warrand, Howard de Walden, Geoffrey H. White and R. S. Lea. 2nd edition. 14 volumes (1-13, but volume 12 spanned two books), London, The St. Catherine Press, 1910-1959. Volume 14, "Addenda & Corrigenda," ed. Peter W. Hammond, Gloucestershire, Sutton Publishing, 1998.