William de Mandeville
Encyclopedia
William de Mandeville inherited the estates of his father Geoffrey
Geoffrey de Mandeville (11th century)
Geoffrey de Mandeville may have been Constable of the Tower of London. His surname comes from the town of Manneville or Magna Villa near Valognes in Manche on the Cotentin Peninsula...

 around 1100. He was constable of the Tower of London
Tower of London
Her Majesty's Royal Palace and Fortress, more commonly known as the Tower of London, is a historic castle on the north bank of the River Thames in central London, England. It lies within the London Borough of Tower Hamlets, separated from the eastern edge of the City of London by the open space...

 at that time, and thus keeper of the first person known to be imprisoned there for political reasons, Ranulf Flambard
Ranulf Flambard
Ranulf Flambard was a medieval Norman Bishop of Durham and an influential government minister of King William Rufus of England...

. Flambard's escape in February, 1101 would have significant consequences for William.

It is not known if William was in some way a confederate of Flambard, or was simply a lax guardian. Either way, king Henry I
Henry I of England
Henry I was the fourth son of William I of England. He succeeded his elder brother William II as King of England in 1100 and defeated his eldest brother, Robert Curthose, to become Duke of Normandy in 1106...

 apparently took away the heart of William's Essex estates. Little is known of William's activities after this.

William probably married Margaret, daughter of Eudo FitzHubert
Eudo Dapifer
Eudo Dapifer was a Norman aristocrat favoured by William the Conqueror.-Early life:Eudo was the fourth son of Hubert of Ryes, who is legendarily known as the loyal vassal who saved the life of Duke William of Normandy in his flight from Valognes during a revolt 1047. Eudo's brothers were Ralph,...

 (Dapifer) and Rohese de Clare. Their son Geoffrey
Geoffrey de Mandeville, 1st Earl of Essex
Geoffrey de Mandeville II, 1st Earl of Essex was one of the prominent players during the reign of King Stephen of England. His biographer, the 19th-century historian J. H...

would recover the seized estates, and gain much else besides.
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