Anglo-Portuguese Alliance
1386 alliance between the UK and Portugal
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Interest in “Anglo-Portuguese Alliance” spiked on Wikipedia on 2026-06-04.
Categorised under History, this article fits a familiar pattern. History articles often trend on anniversaries of notable events, when historical parallels are drawn in the news, or following popular media portrayals.
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Key Takeaways
- The Anglo-Portuguese Alliance (Portuguese: Aliança Luso-Inglesa , "Luso-English Alliance") is the oldest alliance that is still in force by political bilateral agreement.
- The countries were previously allied via the Anglo-Portuguese Treaty of 1373.
- England spearheaded the Anglo-Spanish War (1585–1604) on the side of the deposed Portuguese royal house.
- Portugal aided England, and later the UK, in times of need, for example, in the First World War.
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Source summary
WikipediaThe Anglo-Portuguese Alliance (Portuguese: Aliança Luso-Inglesa, "Luso-English Alliance") is the oldest alliance that is still in force by political bilateral agreement. It was established by the Treaty of Windsor in 1386, between the Kingdom of England (since succeeded by the United Kingdom) and the Kingdom of Portugal (now the Portuguese Republic). The countries were previously allied via the Anglo-Portuguese Treaty of 1373.
Since the signing of the Treaty of Windsor, the Kingdom of Portugal and the Kingdom of England, and later the modern Portuguese Republic and United Kingdom, have never waged war against each other, or participated in wars on opposite sides as independent states, with one brief exception as described below. While Portugal was subsumed under the Iberian Union, rebellious Portuguese factions and government in exile sought refuge and help in England. England spearheaded the Anglo-Spanish War (1585–1604) on the side of the deposed Portuguese royal house.
The alliance has served both countries throughout their respective military histories, influencing the participation of the United Kingdom in the Peninsular War, the UK's major land contribution to the Napoleonic Wars and the establishment of an Anglo-American base in Portugal. Portugal aided England, and later the UK, in times of need, for example, in the First World War. Today, Portugal and the United Kingdom are both part of NATO.
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