- Treaty of Windsor (1386)
The Treaty of Windsor is the oldest diplomatic alliance in the world. The
Anglo-Portuguese Alliancewas renewed in 1386with the Treaty of Windsor and the marriage of King John I of Portugal( House of Aviz) with Philippa of Lancaster, daughter of John of Gaunt. With the victory at the Battle of Aljubarrota, John I was recognized as the undisputed King of Portugal, putting an end to the " interregnum" and anarchy of the 1383–1385 Crisis. Recognition from Castile would arrive only in 1411, with the signature of the Treaty of Ayton-Segovia. The treaty, which remains valid at the present time, established a pact of mutual support between the countries. Portugal used it against its neighbours in 1640, to expel the Spanish kings (House of Habsburg) from the country.
In breach of this Alliance, the British government delivered in
1890an ultimatumto the Portuguese government, forcing it to retreat from that portion of Africa, coveted by Britain, known as the area of the Pink Map.
Portugal fought on the Allied side in
World War Iin accordance with the Treaty.
World War IIthe UK invoked the treaty again to ensure that Portugal would not support the Axis Powers, and in 1943the Portuguese dictator, Salazar, leased to Britain what became a major Allied air and naval base in the Portuguese islands of the Azores. Prime Minister Winston Churchillrecounted reporting on the lease to the House of Commons:
"I have an announcement", I said, "to make to the House arising out the treaty signed between this country and Portugal in the year 1373 between His Majesty King Edward III and King Ferdinand and Queen Eleanor of Portugal." I spoke in a level voice, and made a pause to allow the House to take in the date, 1373. As this soaked in there was something like a gasp. I do not suppose any such continuity of relations between two Powers has ever been, or will ever be, set forth in the ordinary day-to-day work of British diplomacy. [Winston Churchill, Second World War, pp 146-7]
In yet another breach of the Alliance, when, in 1961, the Portuguese provinces of Goa, Daman and Diu were under assault by Jawaharlal Nehru's Indian Union army, Portugal requested the assistance of Great Britain, but it fell on deaf ears.
* [http://www.fco.gov.uk/servlet/Front?pagename=OpenMarket/Xcelerate/ShowPage&c=Page&cid=1007029394365&a=KCountryProfile&aid=1019061813652 Country profile of Portugal,
Foreign and Commonwealth Officewebsite]
List of treaties
Timeline of Portuguese history
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