St Bilo's church is dedicated to a local saint named Bilo, or Beilo, daughter of Brychan. The dedication was recorded as early as the 13th century, but curiously, the church was known for many years as St Milburga's, after the daughter of a 7th century Mercian king and abbess of Wenlock. There must have been a Norman church here, for a reused lintel shows Norman carving motifs, but the building is almost entirely 14th century and later.
The chancel was rebuilt in 1710, and in the 19th century the west end of the church was blocked off and used as a schoolroom. In the south wall is a small window in Early English style, possibly a hermit, or leper window, and in the north wall is a blocked priest's door topped with a lintel carved with a traditional Norman diamond motif, suggesting an 11th-12th century date.
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.