The church of Saints Julián and Basilisa was originally built in the late twelfth century. Two inscriptions are provided, one, on the west window of the portico, dates the work to 1186 and names the sculptor Juan de Piasca, and the other on the baptismal font, states its creation date of 1195. In the sixteenth century, however, the building was heavily reconstructed, leaving only the portico generally intact, albeit walled in. It remained enclosed until the building's modern restoration in 1928. The portico is heavily decorated, including a row of figural and vegetal capitals sculpted in the round, a carved alfiz, and numerous corbels.
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.