Ansgar the Staller or Esegar (c. 1025-1085) was one of the wealthiest and most powerful nobles in late Anglo-Saxon England. He escaped badly wounded from the Battle of Hastings in October 1066, then led the defence of London. His family were of Danish origin and held extensive estates in the Thames Valley, as well as Perivale and Northolt in Middlesex. In 1044, he replaced his father as hereditary Portreeve of London, and Sheriff of Middlesex. Edward the Confessor also made him a Staller, a term of uncertain origin, used for senior officials in his personal household.