Portuguese President Marcelo Rebelo de Sousa views the Treaty of Windsor at Downing Street with Theresa May.
<p>Downing Street displayed the original copies of The Anglo-Portuguese Alliance (or Aliança Luso-Britânica), ratified at the Treaty of Windsor in 1386, between England and Portugal. The Treaty is the oldest alliance in the world that is still in force – with the earliest treaty dating back to the Anglo-Portuguese Treaty of 1373.
</p><p>Credit: Tom Evans
</p>
Copyright: Crown Copyright
UK Prime Minister
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