Clun Castle is a medieval ruined castle in Clun, Shropshire, England. Clun Castle was established by the Norman lord Robert de Say after the Norman invasion of England and went on to become an important Marcher lord castle in the 12th century, with an extensive castle-guard system. Owned for many years by the Fitzalan family, Clun played a key part in protecting the region from Welsh attack until it was gradually abandoned as a property in favour of the more luxurious Arundel Castle. The Fitzalans converted Clun Castle into a hunting lodge in the 14th century, complete with pleasure gardens, but by the 16th century the castle was largely ruined. Slighted in 1646 after the English Civil War, Clun remained in poor condition until renovation work in the 1890s.