A citadel is the most fortified area of a town or city. It may be a castle, fortress, or fortified center. The term is a diminutive of city, meaning "little city", because it is a smaller part of the city of which it is the defensive core.
In a fortification with , the citadel is the strongest part of the system, sometimes well inside the outer walls and bastions, but often forming part of the outer wall for the sake of economy. It is positioned to be the last line of defence, should the enemy breach the other components of the fortification system.
Several settlements in Anatolia, including the Assyrian cities of Kaneš in modern-day Kültepe, featured citadels. Kaneš' citadel contained the city's palace, temples, and official buildings.
In the first millennium BC, the Castro culture emerged in northwestern Portugal and Spain in the region extending from the Douro river up to the Minho River, but soon expanding north along the coast, and east following the river valleys. It was an autochthonous evolution of Atlantic Bronze Age communities. In 2008, the origins of the Celts were attributed to this period by John T. Koch and supported by Barry Cunliffe. The Ave River Valley in Portugal was the core region of this culture,Armando Coelho Ferreira da Silva. A Cultura Castreja no Noroeste de Portugal. Museu Arqueológico da Citânia de Sanfins, 1986 with a large number of small settlements (the castros), but also settlements known as citadels or oppida by the Roman conquerors. These had several rings of walls and the Roman conquest of the citadels of Abobriga, Lambriaca and Cinania around 138 BC was possible only by prolonged siege. Ruins of notable citadels still exist, and are known by archaeologists as Citânia de Briteiros, Citânia de Sanfins, Cividade de Terroso and Cividade de Bagunte.
In the Philippines, the Ivatan people of the northern islands of Batanes often built fortifications to protect themselves during times of war. They built their so-called on hills and elevated areas. These fortifications were likened to European castles because of their purpose. Usually, the only entrance to the castles would be via a rope ladder that would only be lowered for the villagers and could be kept away when invaders arrived.
Barcelona had a great citadel built in 1714 to intimidate the Catalan people against repeating their mid-17th- and early-18th-century rebellions against the Spanish central government. In the 19th century, when the political climate had liberalized enough to permit it, the people of Barcelona had the citadel torn down, and replaced it with the city's main central park, the Parc de la Ciutadella. A similar example is the Citadella in Budapest, Hungary.
The attack on the Bastille in the French Revolution – though afterwards remembered mainly for the release of the handful of prisoners incarcerated there – was to considerable degree motivated by the structure's being a Royal citadel in the midst of revolutionary Paris.
Similarly, after Garibaldi's overthrow of Bourbon rule in Palermo, during the 1860 Unification of Italy, Palermo's Castellamare Citadel – a symbol of the hated and oppressive former rule – was ceremoniously demolished.
Following Belgium gaining its independence in 1830, a Dutch garrison under General David Hendrik Chassé held out in Antwerp Citadel between 1830 and 1832, while the city had already become part of independent Belgium.
The Siege of the Alcázar in the Spanish Civil War, in which the Nationalists held out against a much larger Republican force for two months until relieved, shows that in some cases a citadel can be effective even in modern warfare; a similar case is the Battle of Huế during the Vietnam War, where a North Vietnamese Army division held the citadel of Huế for 26 days against roughly their own numbers of much better-equipped US and South Vietnamese troops.
Since the mid 20th century, citadels have commonly enclosed military command and control centres, rather than cities or strategic points of defence on the boundaries of a country. These modern citadels are built to protect the command centre from heavy attacks, such as aerial or nuclear bombardment. The military citadels under London in the UK, including the massive underground complex Pindar beneath the Ministry of Defence, are examples, as is the Cheyenne Mountain nuclear bunker in the US.
A modern naval interpretation refers to the heaviest protected part of the hull as "the vitals", and the citadel is the semi-armoured freeboard above the vitals. Generally, Anglo-American and German languages follow this while Russian sources/language refer to "the vitals" as цитадель "citadel". Likewise, Russian literature often refers to the turret of a tank as the 'tower'.
The safe room on a ship is also called a citadel.
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