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Iberian Union

Union of Castile, Aragon and Portugal, 1580–1640

  • 16 min read
  • 7 chapters
The Iberian Peninsula and other areas of South Europe with the Councils of the Iberian Union (Not all)
Gabriel Ziegler · CC BY-SA 4.0

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As a personal union, the Kingdom of Portugal, the Crown of Castile and the states of the Crown of Aragon remained independent states, sharing only a single monarch. The kings from the Spanish branch of the House of Habsburg were the only element that connected the multiple kingdoms and territories, ruled by the six separate government councils of Castile, Aragon, Portugal, Italy, Flanders-Burgundy, and the Indies. For periods, Portugal maintained a viceroy, appointed by the king, although the turnover was often rapid; in the 60 years of the Union, the country had 13 viceroys and four regency councils (see List of viceroys of Portugal). Similar viceroys were appointed in Aragon, Catalonia, Valencia and other kingdoms of the Union. The governments, institutions, and legal traditions of each kingdom remained independent of one another. Alien laws (Leyes de extranjería) determined that a national of one kingdom was a foreigner in all other kingdoms.

Possessing territories in all known continents of the time, the Iberian Union was the most wide-spread empire of the early modern era. The Union led to Portugal's involvement in the Dutch Revolt against Spain. The Dutch Republic in turn saw the union as a justification to start targeting Portuguese colonies and would weaken Portugal's overseas empire in the Orient.

Background

The unification of the peninsula had long been a goal of the region's monarchs with the intent of restoring the Visigothic monarchy. Sancho III of Navarre and Alfonso VII of León and Castile had both taken the title Imperator totius Hispaniae, meaning "Emperor of All Hispania". There were many attempts to unite the different kingdoms after Alfonso VII's death in 1109, especially through a policy of intermarriage. Some of the most famous attempts are those of Miguel da Paz, who would inherit the crowns of Portugal, Leon, Castile, and Aragon, but who died at a young age; and those of Afonso, Prince of Portugal, who was to marry the eldest daughter of the Catholic Monarchs, if not for his untimely death by an accident in which he fell off his horse.

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