An enclosure castle is a fortified residence or stronghold, in which defence is facilitated by walls and towers.
In enclosure castles without great towers or keeps, there would often be other buildings including, warden's houses, barracks, kitchens, stables, and chapels.
Some enclosure castles were constructed as newly formed ringworks, or were adapted from extant wooden motte-and-bailey structures.
[1] Their form developed in the 12th century as the military experience gained by the crusaders was introduced into their home residences.
They occur throughout England though more are located near the vulnerable channel ports in Kent and Sussex, and by Edward I along the Welsh borders.