San Crisogono in Trastevere is dedicated to the martyr Saint Chrysogonus. It was probably built in the 4th century under Pope Silvester I (314–335), rebuilt in the 12th century by John of Crema, and again by Giovanni Battista Soria, funded by Scipione Borghese, in the early 17th century.
The bell tower dates from the 12th century rebuilding. The interior of the church was rebuilt in the 1620s on the site of a 12th-century church. The 22 granite columns in the nave are reused antique columns. The floor is cosmatesque mosaic, but most of it is hidden by the pews. The confessio in the sanctuary area is from the 8th century. The high altar is from 1127, with a baldachino from (1627 or 1641) by G.B Soria.
Remains from the first church, possibly from the reign of Constantine I, and earlier Roman houses can be seen in the lower parts, reached by a staircase in the sacristy. The ruins are confusing, but you can easily find the apse of the old church and you can see the remains of the martyr's shrine in middle of the apse wall. The church had an uncommon form; rather than the normal basilical plan with a central nave and two aisles on the sides, it had a single nave.
The paintings are from the 8th to the 11th century, and include Pope Sylvester Capturing the Dragon, St Pantaleon Healing the Blind Man, St Benedict Healing the Leper and The Rescue of St Placid.
Several sarcophagi have been preserved here, some beautifully decorated.
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.