The Patras Castle was built around the mid-6th century AD above the ruins of the ancient acropolis of the city of Patras, on a low outlying hill of the Panachaiko Mountain. The castle consists of a triangular outer wall, strengthened by towers and gates and further protected originally by a moat, and an inner compound on the northeastern corner, also protected by a moat.
The first castle on the spot was built by Byzantine emperor Justinian I after the catastrophic earthquake of 551, re-using building material from pre-Christian structures.
The fort remained in constant use thereafter, even until the Second World War. In the Byzantine period, it was besieged by Slavs, Saracens, Normans and many others, but it never fell. In particular, the successful repulsion of a great siege of 805 AD by the Arabs and the Slavs was attributed to the city's patron saint, St Andrew.
In 1205, in the aftermath of the Fourth Crusade, it was taken over by the Franks, who strengthened it further, opening a moat on all three sides. In 1278, the Principality of Achaea pawned it to the local Latin (Catholic) Archbishop, while the Pope leased it to the Venetians for five years in 1408. The Latin Archbishop remained in possession of the castle until 1430, when it was taken by the Despot of the Morea and future last Byzantine emperor, Constantine Palaiologos, who made extensive repairs to its walls. The castle fell to the Ottoman Turks in 1458, and remained one of their main seats of power in the Peloponnese throughout the Tourkokratia. The Venetians took the castle in 1687 during the Morean War, and kept it until the Morea was retaken by the Turks in 1715, who called it Balya Badra.
Following independence, the castle remained in use by the Greek Army until after World War II. In 1973, the castle was turned over to the 6th Ephorate of Byzantine Antiquities. It is used nowadays for cultural events, especially during summer, and features a theatre with a capacity of 640 seats.
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.