Cuéllar Castle is conserved in good condition, and it has been built in different architectural styles between the 13th and 18th century. Much of the castle in the Gothic and Renaissance styles. The military building was extended and transformed in the 16th century, turning it into the palace of the Duke of Alburquerque. Among its historical owners, stands out Álvaro de Luna and Beltrán de la Cueva, as well as the successive Dukes of Alburquerque.
The Dukes of Alburquerque lived in this castle for centuries until they moved to Madrid to be close to the court. Thereafter their use of the castle was as leisure and holidays palace, abandoning the building slowly. At the late 19th century the castle was almost completely abandoned, and was victim of robberies. In 1938 was a political prison was settled within the castle, and after was established also a sanatorium for prisoners affected by tuberculosis. It was used as prison till 1966.
In 1972, the Department of Fine Arts carried out an intensive restoration, and made it the home of a Vocational Education school, which continues to this day.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.