About 1200 the original fortress Kasteln was built in the middle Schenkenberger valley, a few kilometers away from Schenkenberg Castle. In 1238 the castle is first mentioned in a deed of gift to the residents of the castle who were vassals of the Kyburgs. In 1262 Ruchenstein castle was built on the cliff directly behind the fort for the Knight of Ruchenstein. After the extinction of the Kyburg line in 1264, the castle came under the power of the House of Habsburg. Then in 1301 the Ruchenstein line died out, ten years after they had been given the fort as a gift by the Habsburgs. Both castles were acquired by the lords of Mülinen from Brugg. From here, they ruled over a small area on the southern edge of the Jura.
The castle belonged to the family of Mülinen until 1631 when Johann Ludwig von Erlach bought both castles. The Bernese patrician and general ordered the reconstruction of the castle in 1642 to a representative of manor house. Ruchenstein castle was demolished a year later and served as a building material supplier. Because the builder had no previous expertise, and the client was mostly absent, the conversion proved to be expensive and lasted until 1650. After about a century in the possession of the family of Erlach, in 1732 Bern bought the little bailiwick for 90,000 Taler.
After the fall of the Ancien Régime and the Act of Mediation in 1803, the bailiwick came into possession of the newly formed canton of Aargau. The castle was sold in 1836 to a private citizen. In 1855 the brothers Frederick and Louis Carnival of Aarau acquired the property and opened a 'rescue institution for orphans and neglected pupils' of the Reformed denomination. On 24 August 1907 one of the pupils set the castle and adjacent barn on fire. Both buildings suffered heavy damage and had to be rebuilt. It wasn't until 1909 that the Institute started operations in the manor again.
The Institute received the status of a foundation in 1923 and was converted in 1955 in a boarding school for students with behavioral problems. In 1969 next to the castle they built a second school building, swimming pool and a staff house. The entire castle was extensively renovated in 2009 inside and out and adapted to the current needs of the social education.
Kasteln is the only uniform baroque palace built in the Aargau. The current design is mainly due to the modifications under Johann Ludwig von Erlach. At the core is a four-story medieval castle with two-story wings, from 1642–50, to the east and west. The wings were built partly from material from the demolished castle Ruchenstein. The unusually rich interior of the castle in 1907 was lost in the fire.
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Pembroke Castle is a Norman castle, founded in 1093. It survived many changes of ownership and is now the largest privately owned castle in Wales. It was the birthplace of Henry Tudor (later Henry VII of England) in 1457.
Pembroke Castle stands on a site that has been occupied at least since the Roman period. Roger de Montgomerie, 1st Earl of Shrewsbury founded the first castle here in the 11th century. Although only made from earth and wood, Pembroke Castle resisted several Welsh attacks and sieges over the next 30 years. The castle was established at the heart of the Norman-controlled lands of southwest Wales.
When William Rufus died, Arnulf de Montgomery joined his elder brother, Robert of Bellême, in rebellion against Henry I, William's brother and successor as king; when the rebellion failed, he was forced to forfeit all his British lands and titles. Henry appointed his castellan, but when the chosen ally turned out to be incompetent, the King reappointed Gerald in 1102. By 1138 King Stephen had given Pembroke Castle to Gilbert de Clare who used it as an important base in the Norman invasion of Ireland.
In August 1189 Richard I arranged the marriage of Isabel, de Clare's granddaughter, to William Marshal who received both the castle and the title, Earl of Pembroke. He had the castle rebuilt in stone and established the great keep at the same time. Marshal was succeeded in turn by each of his five sons. His third son, Gilbert Marshal, was responsible for enlarging and further strengthening the castle between 1234 and 1241.
Later de Valence family held Pembroke for 70 years. During this time, the town was fortified with defensive walls, three main gates and a postern. Pembroke Castle became de Valence's military base for fighting the Welsh princes during the conquest of North Wales by Edward I between 1277 and 1295.
Pembroke Castle then reverted to the crown. In the 15th and 16th centuries, the castle was a place of peace until the outbreak of the English Civil War. Although most of South Wales sided with the King, Pembroke declared for Parliament. It was besieged by Royalist troops but was saved after Parliamentary reinforcements arrived by sea from nearby Milford Haven. Parliamentary forces then went on to capture the Royalist castles of Tenby, Haverfordwest and Carew.
In 1648, at the beginning of the Second Civil War, Pembroke's commander Colonel John Poyer led a Royalist uprising. Oliver Cromwell came to Pembroke on 24 May 1648 and took the castle after a seven-week siege. Its three leaders were found guilty of treason and Cromwell ordered the castle to be destroyed. Townspeople were even encouraged to disassemble the fortress and re-use its stone for their purposes.
The castle was then abandoned and allowed to decay. It remained in ruins until 1880, when a three-year restoration project was undertaken. Nothing further was done until 1928, when Major-General Sir Ivor Philipps acquired the castle and began an extensive restoration of the castle's walls, gatehouses, and towers. After his death, a trust was set up for the castle, jointly managed by the Philipps family and Pembroke town council.
The castle is sited on a strategic rocky promontory by the Milford Haven Waterway. The first fortification on the site was a Norman motte-and-bailey. It had earthen ramparts and a timber palisade.
In 1189, Pembroke Castle was acquired by William Marshal. He soon became Lord Marshal of England, and set about turning the earth and wood fort into an impressive Norman stone castle. The inner ward, which was constructed first, contains the huge round keep with its domed roof. Its original first-floor entrance was through an external stairwell. Inside, a spiral staircase connected its four stories. The keep's domed roof also has several putlog holes that supported a wooden fighting-platform. If the castle was attacked, the hoarding allowed defenders to go out beyond the keep's massive walls above the heads of the attackers.
The inner ward's curtain wall had a large horseshoe-shaped gateway. But only a thin wall was required along the promontory. This section of the wall has a small observation turret and a square stone platform. Domestic buildings including William Marshal's Great Hall and private apartments were within the inner ward. The 13th century keep is 23 metres tall with walls up to 6 metres thick at its base.
In the late 13th century, additional buildings were added to the inner ward, including a new Great Hall. A 55-step spiral staircase was also created that led down to a large limestone cave, known as Wogan Cavern, beneath the castle. The cave, which was created by natural water erosion, was fortified with a wall, a barred gateway and arrowslits. It may have served as a boathouse or a sallyport to the river where cargo or people could have been transferred.
The outer ward was defended by a large twin-towered gatehouse, a barbican and several round towers. The outer wall is 5 metres thick in places and constructed from Siltstone ashlar.
Although Pembroke Castle is a Norman-style enclosure castle with great keep, it can be more accurately described as a linear fortification because, like the later 13th-century castles at Caernarfon and Conwy, it was built on a rocky promontory surrounded by water. This meant that attacking forces could only assault on a narrow front. Architecturally, Pembroke's thickest walls and towers are all concentrated on its landward side facing the town, with Pembroke River providing a natural defense around the rest of its perimeter.