English Heritage (officially the English Heritage Trust) is a registered charity that looks after the National Heritage Collection. English Heritage is steward of over 400 significant historical and archaeological sites. It has direct ownership over some historic sites and also liaises with private owners of sites that are managed under guardianship arrangements. In Somerset there are twelve sites, ranging from Neolithic sites such as Stanton Drew stone circles and Stoney Littleton Long Barrow through medieval castles and religious sites such as Farleigh Hungerford Castle and Cleeve Abbey to the most recent, Sir Bevil Grenville's Monument, which was erected in 1720.