Treaty of Windsor (1386)

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Treaty of Windsor
Signed 1386 (1386)

The Treaty of Windsor is the diplomatic alliance signed between Portugal and England on 9 May 1386[1] at Windsor 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, John I was recognized 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 between the countries. This document is preserved at the Portuguese National Archives.[2]

Historian Matthew Winsett says, "This treaty has been the cornerstone of both nations' relations with each other ever since."[3]

See also[edit]