San Nicolás de la Villa is one of the twelve Fernandine churches built in the city after its conquest by King Ferdinand III of Castile (1236), in Gothic-Mudéjar style, although it was completed only in the following centuries, with much renovation added in the meantime. The main portal, in Renaissance style, was added by Hernán Ruiz the Younger in the 16th century. The octagonal tower, with a defensive appearance, was rebuilt during the age of the Catholic Monarchs above an older Islamic minaret.
In the 17th and 18th century, much of the church's elements were modified until it received the current mostly Baroque appearance. The baptistery dates from 1555.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.