page_title: Barcelona
section_title: Barcelona under the Spanish monarchy
hierarchical_section_title: Barcelona / History / Barcelona under the Spanish monarchy
caption_attribution_description: English: Old medieval fortress situated on top of Montjuic in Barcelona, Spain.
context_page_description: Barcelona is a city on the coast of northeastern Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second most populous municipality of Spain. With a population of 1.6 million within city limits, its urban area extends to numerous neighbouring municipalities within the Province of Barcelona and is home to around 4.8 million people, making it the fifth most populous urban area in the European Union after Paris, the Ruhr area, Madrid, and Milan. It is one of the largest metropolises on the Mediterranean Sea, located on the coast between the mouths of the rivers Llobregat and Besòs, and bounded to the west by the Serra de Collserola mountain range, the tallest peak of which is 512 metres high.
  Founded as a Roman city, in the Middle Ages Barcelona became the capital of the County of Barcelona. After merging with the Kingdom of Aragon, Barcelona continued to be an important city in the Crown of Aragon as an economic and administrative centre of this Crown and the capital of the Principality of Catalonia. Barcelona has a rich cultural heritage and is today an important cultural centre and a major tourist destination.
context_section_description: The marriage of Ferdinand II of Aragon and Isabella I of Castile in 1469 united the two royal lines. Madrid became the centre of political power whilst the colonisation of the Americas reduced the financial importance (at least in relative terms) of Mediterranean trade. Barcelona was a centre of Catalan separatism, including the Catalan Revolt (1640–52) against Philip IV of Spain. The great plague of 1650–1654 halved the city's population.
  In the 18th century, a fortress was built at Montjuïc that overlooked the harbour. In 1794, this fortress was used by the French astronomer Pierre François André Méchain for observations relating to a survey stretching to Dunkirk that provided the official basis of the measurement of a metre. The definitive metre bar, manufactured from platinum, was presented to the French legislative assembly on 22 June 1799. Much of Barcelona was negatively affected by the Napoleonic wars, but the start of industrialisation saw the fortunes of the province improve.
caption: The fortress at Montjuïc, the most southerly point from which measurements were made when calculating the meridional definition of the metre
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