Originally the Ducal Palace of Lerma had immense gardens below it, on the banks of the river, with fountains, stately homes and seven chapels, of which one (Cristo) remains. All documents relating to its construction have been conserved. A 17th-century work, building started in 1601 under commission from Francisco Gómez de Sandoval y Rojas, Duke of Lerma. Its architect was Francisco de Mora and is it is considered de Mora's masterwork and one of the finest buildings of that era.
During the Spanish Civil War the building was used as a prison. It is currently used as a parador.
The doorway is crowned by a frontispiece held up by columns. The large walnut door is decorated with 520 bronze nails. Above the door are two of the duke's coat-of-arms, decorated with laurel. The railings of the windows and balconies are painted blue and gold.
The interior of the patio round arches on each side. The columns are made of single pieces of granite (the quarries were owned by the duke). On the upper level the columns do not support arches, but rather a running frieze with iron balconies between them, and windows which were originally made from walnut wood.
The palace has four towers at the corners, whose spires were also recovered after the restoration works. No palace could have more than two towers except those belonging to kings, but the Duke of Lerma was given this privilege due to his great powers in Court.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.