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Spain–United Kingdom relations, also called Anglo-Spanish relations, are the bilateral international relations between Spain and the United Kingdom.
The history of Spanish–British relations is complicated by the political heritage of the two countries. Neither the United Kingdom nor Spain has a unique constitutional ancestor; the United Kingdom was originally created by a union of the kingdoms of England and Scotland (and later joined by Ireland), whilst the Kingdom of Spain was initially created by a union of the kingdoms of Castile and Aragon. They have also been complicated by the fact that the United Kingdom and Spain were both imperial powers, after the same land, an occurrence which is being played out to this day with the disputed ownership and status of Gibraltar.
For centuries, the role of England, and subsequently the United Kingdom, in Iberia was coloured by the Anglo-Portuguese Alliance. Relations with Portugal always have been closer than those with Spain, and Spain and the United Kingdom have gone to war twice over Portugal's independence.
In 1384, at the height of the Hundred Years' War, England provided reinforcements to King João I to thwart a French-backed Castilian invasion. These forces saw action at the decisive battle of Aljubarrota, and proved to be vital in securing the continued independence of Portugal from its larger neighbours.
The alliance submerged into crisis when Portugal supported Joan of Castile instead of her aunt Isabella I of Castile during the War of the Castilian Succession of 1474–1479, because France also supported Joan's candidature. In the following years, the English collaborated with the Catholic Monarchs, there were weddings between English and Spanish heir princes and a small group of English soldiers even fought on the Castilian side during the conquest of Granada. However, the struggle of Elizabeth I of England against Philip II of Spain in the sixteenth century led to the new English support of the Portuguese independence movement that finished in 1640 with the crowning of King João IV of Portugal (not recognized by Spain until 1668). In following centuries, Portugal and the United Kingdom were closely allied in their politics and wars against Spain, which closely collaborated with France after the Spanish War of Succession (1700–1714) that established the House of Bourbon on the Spanish throne.