The village of El Barco de Avila is situated in the foothills of the Sierra de Gredos mountain range. After the conquest of Toledo and the retreat of the Muslim lines to the south bank of the river Tajo, King Alfonso VI donated this valley to his daughter and ordered his son-in-law Ramon de Borgoña to erect a fortification and to repopulate the surrounding area.
There is few documented data of the construction of the present castle but due to its architectural design it is dated to the end of the 15th century. The castle, built of granite rubblework, is situated on a small hill on the east bank of the Tormes river. Its groundplan, similar to that of other castles on the Castilian plateau, is a square with circular towers on the corners and sentry boxes in three of its curtain walls. The fourth curtain wall contains the rectangular keep.
The entrance to the keep is on a higher floor level, facing the courtyard. Although totally dismantled you can see traces of two floor levels and columns around a central patio in the walls and floor of the courtyard. Also underground rooms and rain tanks exist beneath the courtyard.
The territory of Valdecorneja is linked to the Alba family since the 14th century when King Enrique II de Trastámara donated it to Don Garci Alvarez de Toledo. It is probably one of the descendants of this first Lord of Valdecorneja who built the present castle.
References:Goryōkaku (五稜郭) (literally, 'five-point fort') is a star fort in the Japanese city of Hakodate on the island of Hokkaido. The fortress was completed in 1866. It was the main fortress of the short-lived Republic of Ezo.
Goryōkaku was designed in 1855 by Takeda Ayasaburō and Jules Brunet. Their plans was based on the work of the French architect Vauban. The fortress was completed in 1866, two years before the collapse of the Tokugawa Shogunate. It is shaped like a five-pointed star. This allowed for greater numbers of gun emplacements on its walls than a traditional Japanese fortress, and reduced the number of blind spots where a cannon could not fire.
The fort was built by the Tokugawa shogunate to protect the Tsugaru Strait against a possible invasion by the Meiji government.
Goryōkaku is famous as the site of the last battle of the Boshin War.