Their Royal Highnesses The Duke and Duchess of Edinburgh will visit Portugal, celebrating the enduring historical ties and modern relationship between the UK and Portugal.
The visit next week, from June 1st to June 3rd 2026, will mark the 640th anniversary of the Treaty of Windsor, which underpins the world’s oldest diplomatic alliance.
From Lisbon to Porto, The Duke and Duchess will undertake engagements in support of issues important to Their Royal Highnesses, including youth opportunity, sports inclusion and Women, Peace and Security.
The programme will include visits to historic sites reflecting UK– Portugal heritage, alongside meetings with students, community organisations, and highlighting innovative partnerships.
Background
- This is the first Royal visit to Portugal since 2011, when The King and Queen, as Prince of Wales and Duchess of Cornwall, visited.
- The Duke and Duchess of Edinburgh last visited Portugal together in May 2005, as The Earl and Countess of Wessex. The Duke more recently visited in June 2009.
- The Treaty of Windsor (1386) cemented the alliance between Portugal and what is now the United Kingdom. It was sealed by the marriage of King João I and Philippa of Lancaster, who became Queen of Portugal. Their children became the ‘Illustrious Generation’, including Henry the Navigator – a key figure in Portugal’s early maritime exploration.
Official release by British Embassy Lisbon
