Castle of the 14th century, reformed during the 15th and 16th centuries. It has a pentagonal ground plan and a large Tower of Homage. Inside, it has a Cereal Museum.
King Pedro I, the Cruel, locked his wife Blanca de Borbón in the castle. Juan II and Enrique IV possessed it, the latter handed it to don Álvaro de Zúñiga; between 1476 and 1480, Zúñiga and the Catholic Monarchs negotiated a compesation for Arévalo and, in the ends, the village was taken over by the Crown. Subsequently it became a state prison.
https://www.turismocastillayleon.com/en/art-culture-heritage/castles/castle-arevalo

Castillo de Arévalo

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The Castle of Coca is a castle located in the Coca municipality, central Spain. The castle was constructed in the 15th century and has been considered to be one of the best examples of Spanish Mudejar brickwork which incorporates Moorish Muslim design and construction with Gothic architecture. A scale model of the castle has been built in the Mudéjar theme park and another replica built at a ratio of 1:25 is placed in the Minimundus miniature park in Klagenfurt, Austria.
Location
Coca Castle is located on the outskirts of the town of Coca, about 45 kilometers (30 miles) to the north of Segovia, on a slope. It overlooks the meander of the River Voltoya, a tributary of River Eresma. It is one of the few Spanish castles that have not been constructed on hilltops; rather it has been constructed on a steep esplanade. Coca is the birthplace of the Roman Emperor Theodosius I. The site has been inhabited since the second century BC when the Arevaci arrived and settled here. The castle is surrounded by a deep and wide moat that is one of the fortifying features as well.
Ownership
Coca castle was owned by the well-known Spanish aristocratic family the House of Alba de Tormes (sometimes known as the House of Alba) until the mid-nineteenth century. They handed over the property to Ministry of Agriculture in 1954. It has been declared a Spanish National Monument and is under protection.
Construction and architecture
The castle was constructed under the supervision of a Moorish architect and engineer. Such Moorish engineers were routinely commissioned to construct large buildings during the medieval times and were called "Alarife" (one who understand the art of construction). Brick has been used for most of the construction. However, the bricks used in the castle are different from ordinary bricks used to build houses. These are hardened bricks that are capable of withstanding enemy onslaught during sieges. The bricks have been laid smooth with the mortar, so the lines of the brickwork are clearly visible along with the mortar. This creates a distinctive pattern on the castle. The castle has been constructed in classic Mudéjar fashion. Brickwork and plaster work have been used to create geometrical patterns depicting a hybrid of Moorish Muslim and Christian Gothic architecture. While the main construction is of brick, limestone and plaster have been used in the balistraria, the embrasures. White limestone has also been used to decorate columns in the courtyard and the keep, as well as numerous other features on the facade of the keep.
Design and fortifications
The ground plan of the castle is rectangular, and it has a three-tiered defence system consisting of wall circuits enclosed within a moat and a central keep. The central keep is situated in the northern part of the castle and is known as the Tower of Homage.There are two curtain walls that enclose the enceinte, but the outer curtain wall is not intact. Today there are traces of the outer curtain wall, as well as a number of towers – some in ruins others standing – that mark the boundary where the outer moat circled the castle. All of the outer towers were rectangular in shape.The second curtain wall has a gate near the inner keep with a high brick arch enclosed by a geometric border, the alfiz, which is a classic Moorish design feature. The inner curtain wall has several towers and a talus as well. It has centered cylindrical towers on each side and smaller turrets between them, while the talus is constructed all the way down to the moat.
The towers on the corners of the walls are rectangular. The surviving wall is machicolated. This coupled with the talus served as a formidable defence. The battlements on the walls have been constructed as both ornament and as defensive fortifications, so they have been built with crests that jut out from the walls. Brickwork in Mudejar has been used here as well.
History
Early history
The oldest settlements in Coca date back to the Chalcolithic era, around 2,500–2,300 BC. The abundance of natural water and the geographical features were important for early settlers. In the fifth century CE, the village grew substantially, forming the historic city of Coca. The town of Coca was first established during Roman rule. It was called Cauca at that time. In 1439 Coca came under the control of Marquis of Santillana. In 1451 negotiations between Santillana and Fonseca families started. These would later culminate in 1453 with Coca being exchanged for Saldaña. Construction of the Coca Castle began as soon as the treaty was ratified by Juan II. 
Medieval history
Alonso de Fonseca y Avellaneda has been credited with the construction of the castle. The castle was built under the supervision of a master builder and most of the work had been completed by 1493. In 1502 it was decreed that castle and the town could only be passed down to male heirs, so after Alonso's death it passed on to Antonio de Fonseca. In 1512 a number of extra ornamental features were added to the keep and the castle exterior under the supervision of engineers. The castle came under attack during the Revolt of the Comuneros in 1521. Communeras troops attacked the castle in retaliation to the burning of Medina del Campo. Medina del Campo had been previously attacked by the Royalists as it housed a large number of artillery pieces, and it had subsequently been razed after Royalists met heavy resistance. In 1645, Gaspar Alfonso Pérez de Guzmán, 9th Duke of Medina Sidonia was accused to treachery after he instigated the Andalusian independentist conspiracy of 1641, and was imprisoned in the castle.
The castle went through a period of repairs and renovations from the sixteenth to the eighteenth century CE. Most notable among these renovations was the addition of the Patio de Armas in sixteenth century, the construction of a gallery between the Keep (Torres del Homenaje) and Pedro Mata Tower in the seventeenth century CE and the extensive renovations of 1715. After 1730 the castle suffered a long period of neglect that led to it falling into disrepair, and subsequently many important artifacts were either lost or destroyed. During the Peninsular War, Coca Castle was captured by the French, who occupied the castle in 1808 and vacated it in 1812. During these four years the castle further deteriorated and much of it fell into ruin. The French troops were, obviously, not concerned with the upkeep of the castle and many ornamental features fell into ruin during this time. Another incident that led to the castle falling further into ruin was the 1828 sale of materials by the administrator of the castle. As the castle was under the ownership of the House of Alba at that time, the owners tore away a number of columns, marble pieces and other ornamental features and sold them off to the highest bidder.
Modern history
Coca Castle was declared a national monument of Spain by Decree-Law on August 9, 1926. By the same decree, it was nationalized. The control of the castle itself and the adjoining land was taken over by the government of Spain from the House of Alba. No major restorative work was done until 1954 when state-sponsored repairs and renovations were started. The Ministry in charge of the castle wanted to restore it so that they could open a school of forestry training. The repair and renovation work was conducted under the supervision of the Spanish avante garde architect Miguel de los Santos Nicolás. The team of architects, which included Francisco Pons Sorolla was given carte blanche by the General Directorate of Fine Arts. The renovations took four years and were completed in 1958. After the renovations the "Escuela de Capacitación Forestal" (Forestry school) was opened in 1958.

Castillo de Coca

La Muralla de Coca fue una construcción militar ubicada en el municipio segoviano de Coca (Castilla y León).
Del conjunto de muros se conservan únicamente 200 metros de recorrido, y una de las tres puertas de acceso con las que contó el conjunto, la puerta de Segovia, conocida popularmente como la puerta de la Villa. Fue derribada en gran parte entre los siglos XVIII y XIX, y se intentaron recuperar sus restos en el año 2000 a través de una intervención de la Escuela Taller Municipal.
En el año 1931 fue declarado Conjunto Histórico con el nombre de Recinto murado de Coca Puerta de la Villa y bajo el código RI-53-0000548.

Muralla de Coca

It preserves one of the few examples of medieval walls in the Mudejar style in the whole country. The parts that can be seen –which mix the Romanesque, primitive Gothic and Mudejar styles– date back to the 13th and 14th centuries, although many of them have been reconstructed. The original premises, in the shape of an irregular oval, had a 2,300 metre perimeter and an internal area of 390,400 square metres, statistics equalling those of the famous walls of Avilla.
Its average thickness of 1.5 metres was reinforced using exterior eaves and a moat. Mud, stone and bricks were the materials used to build it. Today, 23 of the 60 to 80 original towers are preserved –square or pentagonal–, various wall panels and four doors: Arévalo, Medina, Peñaranda and Cantalapiedra. The last is the most interesting: a pointed arch flanked by two separate towers of different heights, the taller pentagonal and the lower square.
https://www.spain.info

Walls of Madrigal de las Altas Torres

Narros de Saldueña Castle dates from the 15th century. During the Peninsular War (1807–1814) it was occupied by the French army. The conservation took place in 1960s.
https://www.spottinghistory.com