The de Mandeville Family
The 11th Century Geoffrey de Mandeville
The Wikipedia/Wikiwand pages for this Geoffrey indicate that de Mandeville was a contemporary to William the Conqueror. He died in 1100 and was the first Constable of the Tower of London. The Tower was a newly built castle.
His son, William, inherited his lands and was also Constable of the Tower. William was charged with the imprisonment of Ranulf Flambard. His son, William was implicated in the escape of Flambard from the Tower.
Geoffrey, William's son, was very active during The Anarchy. This Geoffery, d. 1144, was my first interest in this history as he was married to Rohse de Vere and was given Belchamp Walter as a dowry.
Geoffrey aligned himself with King Stephen and the Empress Matilda and died rather ignomignously and ended up interred in Temple Church along with William Marshall.
Ranulf Flambard
Ranulf Flambard is thought to have been the chief administrator of the Domesday Survey, in fact he could have been its instigator.
He served William Rufus after the Conquerors death but was imprisoned by Henry I on Rufus's death. His escape from the Tower was under William de Mandeville (d. 1120) in 1101. He then went into exile with Robert Curthose.
The Tower of London - Constable of the Tower
When William built the White Tower on the bank of the river Thames in London he installed Geoffrey de Mandeville as constable.
The Norman bishop Ranulf Flambard was one of the first prisoners and on his escape Willima de Mandeville, Geoffrey's son and inheritor of the constableship, was held somewhat responsible.
William de Mandeville - Constable of the Tower - 1100-1103
Geoffrey, d 1144 - and his part in the Anarchy