The Royal Commission on the Defence of the United Kingdom, which Lord Palmerston had established in 1859 in response to a perceived threat of invasion by Emperor Napoleon III of France, recommended the fort's construction in Tenby. The design of the fort is credited to Colonel William Jervois. It is a simple rectangular work, consisting of three artillery casemates on two opposite sides, for RML 7-inch guns firing through iron shields. A further three gun platforms for RML 9 inch 12 ton guns are located on the roof. The guns facing north were intended to cover Tenby Harbour and the beach towards Saundersfoot, while those facing south covered the beach towards Penally. The entrance at the western (landward) end of the fort is approached by means of a drawbridge over a dry ditch and is defended by two caponiers or 'flanking galleries', each of three storeys pierced with loopholes for small arms fire. At the eastern end at basement level are located the powder magazine and shell store. There was accommodation for a garrison of 150 men.
The work was completed by 1870. In 1907 the fort was decommissioned and sold to the Windsor Richards family who converted it into a private house. The gun shields were replaced by windows and the interior was lavishly decorated, although the fort was apparently garrisoned by the army during the First World War. During the Second World War, the fort was compulsory purchased in 1940 and the house contents were auctioned by Harrods. During the war an anti-aircraft battery was built in front of the fort; units serving there included the Royal Marines, 4th Defence Battery and a Light Anti-Aircraft Battery of the Royal Artillery, a detachment of the Belgian Army, the Home Guard, and an Air Sea Rescue detachment of the RAF.
References:The Beckov castle stands on a steep 50 m tall rock in the village Beckov. The dominance of the rock and impression of invincibility it gaves, challenged our ancestors to make use of these assets. The result is a remarkable harmony between the natural setting and architecture.
The castle first mentioned in 1200 was originally owned by the King and later, at the end of the 13th century it fell in hands of Matúš Èák. Its owners alternated - at the end of the 14th century the family of Stibor of Stiborice bought it.
The next owners, the Bánffys who adapted the Gothic castle to the Renaissance residence, improved its fortifications preventing the Turks from conquering it at the end of the 16th century. When Bánffys died out, the castle was owned by several noble families. It fell in decay after fire in 1729.
The history of the castle is the subject of different legends.