Zeyrek Mosque, formerly the Monastery of the Pantokrator, is a large mosque in Istanbul’s Zeyrek district, overlooking the Golden Horn. Comprising two former Byzantine churches and a chapel, it is the city's best-preserved example of Middle Byzantine architecture and the second-largest surviving Byzantine religious structure after Hagia Sophia.
Built between 1118 and 1136, the complex was founded by Empress Irene of Hungary and later expanded by Emperor John II Komnenos. It housed a monastery, a library, a hospital, and an imperial mausoleum. During Latin rule (1204–1261), it was used by Venetian clergy and later restored to Orthodox monks.
After the Ottoman conquest in 1453, it became a mosque and an Islamic school, named after scholar Molla Zeyrek. Over time, the complex fell into disrepair but was restored in the 21st century and reopened for prayer.
Architecturally, the mosque features Middle Byzantine elements, including cross-shaped churches, domes, and polygonal apses. Though much of its rich decoration is lost, fragments of marble, stained glass, and mosaics remain. The nearby Şeyh Süleyman Mescidi may have been part of the original monastery.
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.