Betchworth Castle was originally an 11th century earthwork fortress, founded by Richard fitz Gilbert. In 1379, Sir John Fitzalan, Marshal of England, founded the stone castle when he was granted a license to crenellate. Standing against an escarpment overlooking the River Mole, are the ruinous remains of a medieval fortified house, which received major mid 15th century alterations. In 1791 William Fenwick, demolished the south western end and turned the remainder into a sandstone and brick country residence. In the 19th century, masonry was removed from the house, with the foundations of the south western end, surviving largely below ground. 5 miles east is Reigate Castle and 6 miles south-west is Abinger Motte.