Elizabeth Castle was built to the site of earlier Catholic St. Helier abbey. The monastic buildings were finally taken over by the Crown at the Reformation. Surviving buildings were used for military purposes. The construction of the Elizabeth castle was started in 1594 when the power of cannon meant that the existing stronghold at Mont Orgueil was insufficient to defend the Island and the port of St. Helier was vulnerable to attack by ships armed with cannon. This work was carried out by the Flemish military engineer Paul Ivy.
Sir Walter Raleigh, the Governor of Jersey between 1600 and 1603, named the castle Elizabeth Castle after Elizabeth I of England. The Lower Ward was constructed, between 1626 and 1636, on the site of the ruined Abbey church. This area of the castle became a parade ground, surrounded by a barrack building and officers' quarters. Wells and cisterns for water existed within this area.
The castle was first used in a military context during the English Civil War in the 17th century. Charles II visited the castle in 1646 and 1649, staying in the Governor's House, and was proclaimed King by governor Sir George Carteret despite the abolition of the monarchy in England. In 1651, a windmill was constructed half-way between Fort Charles and the Lower Ward. In the same year, the Parliamentarian forces landed in Jersey and bombarded the castle with mortars. The destruction of the mediaeval Abbey church in the heart of the castle complex which had been used as the storehouse for ammunition and provisions forced Carteret to surrender, and Jersey was held by Parliamentarians for nine years. In 1668, or shortly afterwards, King William's Gate was constructed, which is located between the Outer Ward, and Lower Ward.
During the Seven Years War, French prisoners were kept at the island. Perhaps the most well known was Jean-Louis Le Loutre. The castle was next involved in conflict in the late 18th century, this time it was with the French. A two-story barracks hospital building was constructed in the early 19th century. A plan to link the castle to the mainland as part of an ambitious harbour project in the 19th century was abandoned. A breakwater linking L'Islet to the Hermitage Rock on which the Hermitage of Saint Helier is built remains, and is used by anglers.
During the Second World War the Germans, who occupied the Channel Islands, modernised the castle with guns, bunkers and battlements. After the Liberation, the castle was repaired and was eventually re-opened to the public.
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.