A 1386 treaty created the oldest diplomatic alliance still active in the world
An enduring friendship between England and Portugal was solidified in 1386 through a treaty that remains the oldest active diplomatic alliance in the world today.
The Treaty of Windsor, signed on May 9, 1386, established a 'perpetual' alliance between England and Portugal that has never been broken. This historic pact was sealed with the marriage of King John I of Portugal to Philippa of Lancaster, the daughter of John of Gaunt.
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