Treaty of Windsor (1386)
Treaty of Windsor (1386)
The Treaty of Windsor is a diplomatic alliance signed between the Kingdom of Portugal and the Kingdom of England on 24 February 1387 in Windsor, Berkshire, and sealed by the marriage of King John I of Portugal (House of Aviz) to Philippa of Lancaster, daughter of John of Gaunt, 1st Duke of Lancaster. With the victory at the Battle of Aljubarrota, assisted by English archers, John I was recognised as the undisputed King of Portugal, putting an end to the interregnum of the 1383–1385 Crisis. The Treaty of Windsor established a pact of mutual support.
Treaty of Windsor (1386)
Copies are preserved at the Torre do Tombo National Archive in Lisbon and The National Archives) in London.
Treaty of Windsor (1386)
!The Treaty in the [National Archives), United Kingdom](//upload.wikimedia.org/wikipedia/commons/thumb/8/8b/Anglo-PortugueseTreatyofWindsor%2C9thMay1386.jpg/500px-Anglo-PortugueseTreatyofWindsor%2C9thMay1386.jpg)
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