In the survey of 1415, there is named a 'Castrum de Belfurth' belonging to 'Dom de Dacre' (Lord Darce), but probably used by Thomas Lylburn, which by 1509 was recommended for a garrison by 40 horsemen. Remains of a moat can be traced although it has been partly built upon and plough damaged. Human bones and a C15 spur were found when enlarging the mill pond, formerly part of the moat, in C19. The 1715 survey records it a "formerly possessed by ye Armorers, now to Sr Robert Shafto."