If you’re enjoying a glass of port during the festive period, you have the world’s oldest treaty to thank.

Winston Churchill once described the Anglo-Portuguese alliance as ‘without parallel in world history.’ Forged in the backdrop of the Hundred Years War 650 years ago, the alliance is the oldest in the world.

In this episode Dan explores the medieval roots of this diplomatic friendship, which has benefitted both nations politically, culturally, and commercially.

Hear why John of Gaunt travelled to an unassuming town outside Porto to lay the foundations of the alliance in the 1300s, and find out how often the treaty’s been invoked in the six centuries since.

From the hills of Porto to west London, Dan and the History Hit team uncover the incredible history of the world's oldest alliance.

Produced and mixed by Mariana Des Forges and Charlotte Long. Special thanks to Portugal-UK 650, Maria Joao Rodrigues de Araujo, and the City Council of Vizela.

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England & Portugal: The Oldest Alliance in the World

Dan Snow's History Hit

England & Portugal: The Oldest Alliance in the World