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The Treaty of Windsor is the diplomatic alliance signed between Portugal and England on 9 May 1386 at
Windsor Windsor may refer to: Places Australia * Windsor, New South Wales ** Municipality of Windsor, a former local government area * Windsor, Queensland, a suburb of Brisbane, Queensland **Shire of Windsor, a former local government authority around Wi ...
and sealed by the marriage of King John I of Portugal (
House of Aviz The House of Aviz (Portuguese language, Portuguese: ''Casa de Avis''), also known as the Joanine Dynasty (''Dinastia Joanina''), was a dynasty of Portuguese people, Portuguese origin which flourished during the Portuguese Renaissance, Renaissance ...
) to
Philippa of Lancaster Philippa of Lancaster ( pt, Filipa ; 31 March 1360 – 19 July 1415) was Queen of Portugal from 1387 until 1415 by marriage to King John I. Born into the royal family of England, her marriage secured the Treaty of Windsor and produced severa ...
, daughter of
John of Gaunt, 1st Duke of Lancaster John of Gaunt, Duke of Lancaster (6 March 1340 – 3 February 1399) was an English royal prince, military leader, and statesman. He was the fourth son (third to survive infancy as William of Hatfield died shortly after birth) of King Edward ...
. With the victory at the
Battle of Aljubarrota The Battle of Aljubarrota (; see Aljubarrota) was fought between the Kingdom of Portugal and the Crown of Castile on 14 August 1385. Forces commanded by King John I of Portugal and his general Nuno Álvares Pereira, with the support of Engli ...
, assisted by English archers, John I was recognised as the undisputed King of Portugal, putting an end to the ''
interregnum An interregnum (plural interregna or interregnums) is a period of discontinuity or "gap" in a government, organization, or social order. Archetypally, it was the period of time between the reign of one monarch and the next (coming from Latin '' ...
'' of the 1383–1385 Crisis. The Treaty of Windsor established a pact of mutual support between the countries. This document is preserved at the Portuguese National Archives. Historian Matthew Winslett says, "This treaty has been the cornerstone of both nations' relations with each other ever since."


See also

*
Anglo-Portuguese Treaty of 1373 The Anglo-Portuguese Treaty of 1373 was signed on 16 June 1373 between King Edward III of England and King Ferdinand and Queen Eleanor of Portugal. It established a treaty of "perpetual friendships, unions ndalliances" between the two seafa ...
*
British Ultimatum of 1890 The 1890 British Ultimatum was an ultimatum by the British government delivered on 11 January 1890 to the Kingdom of Portugal. The ultimatum forced the retreat of Portuguese military forces from areas which had been claimed by Portugal on the ba ...
*
Timeline of Portuguese history __NOTOC__ This is a timeline of Portuguese history, comprising important legal and territorial changes and political events in Portugal and its predecessor states. To read about the background to these events, see History of Portugal. Centuri ...
*
Anglo-Portuguese Alliance The Anglo-Portuguese Alliance (or , "Luso-English Alliance") is the oldest alliance based on known history in the world that is still in force by politics. It was established by the Treaty of Windsor in 1386, between the Kingdom of England ( ...
*
Treaty of Tagilde The Treaty of Tagilde was a treaty signed on 10 July 1372 in Tagilde, a village in Portugal. It was signed by King Fernando I of Portugal and representatives of John of Gaunt, Duke of Lancaster, a claimant to the Crown of Castile and son of th ...


References


Bibliography


Country profile of Portugal
Foreign, Commonwealth and Development Office The Foreign, Commonwealth & Development Office (FCDO) is a department of the Government of the United Kingdom. Equivalent to other countries' ministries of foreign affairs, it was created on 2 September 2020 through the merger of the Foreig ...
website * * History of Berkshire Windsor 1386 Windsor 1386 Windsor, Berkshire 14th century in Portugal 1386 in England
Windsor Windsor may refer to: Places Australia * Windsor, New South Wales ** Municipality of Windsor, a former local government area * Windsor, Queensland, a suburb of Brisbane, Queensland **Shire of Windsor, a former local government authority around Wi ...
England–Portugal relations {{England-hist-stub