Anglo-Portuguese Treaty of 1373
Encyclopedia
The Anglo-Portuguese Treaty of 1373 was signed between King Edward III
Edward III of England
Edward III was King of England from 1327 until his death and is noted for his military success. Restoring royal authority after the disastrous reign of his father, Edward II, Edward III went on to transform the Kingdom of England into one of the most formidable military powers in Europe...

 of England
Kingdom of England
The Kingdom of England was, from 927 to 1707, a sovereign state to the northwest of continental Europe. At its height, the Kingdom of England spanned the southern two-thirds of the island of Great Britain and several smaller outlying islands; what today comprises the legal jurisdiction of England...

 and King Ferdinand
Ferdinand I of Portugal
Ferdinand I , sometimes referred to as the Handsome or rarely as the Inconstant , was the ninth King of Portugal and the Algarve, the second son of Peter I and his wife, Constance of Castile...

 and Queen Eleanor
Leonor Telles de Menezes
Leonor Telles de Menezes was a queen consort of Portugal and regent during the years 1383–1385. She was the wife of a Portuguese nobleman from whom she was forcibly divorced by King Ferdinand I, who afterward married her...

 of Portugal
Portugal
Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

. It established a treaty
Treaty
A treaty is an express agreement under international law entered into by actors in international law, namely sovereign states and international organizations. A treaty may also be known as an agreement, protocol, covenant, convention or exchange of letters, among other terms...

 of "perpetual friendships, unions [and] alliances" between the two seafaring nations. It is the oldest active treaty in the world.

It was reinforced throughout history, including in 1386, 1643, 1654, 1660, 1661, 1703, 1815 and by a secret declaration in 1899. It was recognized in the Treaties of Arbitration in the 20th century between Britain and Portugal in 1904 and 1914.

The treaty was temporarily void during the Iberian Union
Iberian Union
The Iberian union was a political unit that governed all of the Iberian Peninsula south of the Pyrenees from 1580–1640, through a dynastic union between the monarchies of Portugal and Spain after the War of the Portuguese Succession...

 from 1580 to 1640, when Spain and Portugal were united. However, with Portugal's independence, the alliance returned & came to a new height during the Napoleonic wars
Napoleonic Wars
The Napoleonic Wars were a series of wars declared against Napoleon's French Empire by opposing coalitions that ran from 1803 to 1815. As a continuation of the wars sparked by the French Revolution of 1789, they revolutionised European armies and played out on an unprecedented scale, mainly due to...

 when the British sent their best general, the Duke of Wellington
Duke of Wellington
The Dukedom of Wellington, derived from Wellington in Somerset, is a hereditary title in the senior rank of the Peerage of the United Kingdom. The first holder of the title was Arthur Wellesley, 1st Duke of Wellington , the noted Irish-born career British Army officer and statesman, and...

, to sap Napoleon's armies in the Peninsular War
Peninsular War
The Peninsular War was a war between France and the allied powers of Spain, the United Kingdom, and Portugal for control of the Iberian Peninsula during the Napoleonic Wars. The war began when French and Spanish armies crossed Spain and invaded Portugal in 1807. Then, in 1808, France turned on its...

.

It was activated again during the Second World War, whereupon the Portuguese remained neutral, in agreement with Britain, which did not want to bring the war into the Iberian Peninsula
Iberian Peninsula
The Iberian Peninsula , sometimes called Iberia, is located in the extreme southwest of Europe and includes the modern-day sovereign states of Spain, Portugal and Andorra, as well as the British Overseas Territory of Gibraltar...

, until 1943, when it was fully reactivated by the National Government of Winston Churchill
Winston Churchill
Sir Winston Leonard Spencer-Churchill, was a predominantly Conservative British politician and statesman known for his leadership of the United Kingdom during the Second World War. He is widely regarded as one of the greatest wartime leaders of the century and served as Prime Minister twice...

 and Portugal. Britain, after three months' negotiations, was accorded aerodrome and nautical facilities in the Portuguese Azores
Azores
The Archipelago of the Azores is composed of nine volcanic islands situated in the middle of the North Atlantic Ocean, and is located about west from Lisbon and about east from the east coast of North America. The islands, and their economic exclusion zone, form the Autonomous Region of the...

 to help combat the U-boat
U-boat
U-boat is the anglicized version of the German word U-Boot , itself an abbreviation of Unterseeboot , and refers to military submarines operated by Germany, particularly in World War I and World War II...

 threat. The British also cited the treaty during the 1982 Falklands War
Falklands War
The Falklands War , also called the Falklands Conflict or Falklands Crisis, was fought in 1982 between Argentina and the United Kingdom over the disputed Falkland Islands and South Georgia and the South Sandwich Islands...

.

Despite the fact that the treaty has technically been in effect for nearly 650 years does not mean that it has always been practically carried out. Widespread war has rarely been waged between the two, but that does not mean it has never been. In the Dutch-Portuguese War
Dutch-Portuguese War
The Dutch–Portuguese War was an armed conflict involving Dutch forces, in the form of the Dutch East India Company and the Dutch West India Company, against the Portuguese Empire. Beginning in 1602, the conflict primarily involved the Dutch companies invading Portuguese colonies in the Americas,...

, the British (and to a lesser extent the French), seeking to curtail Habsburg
Habsburg
The House of Habsburg , also found as Hapsburg, and also known as House of Austria is one of the most important royal houses of Europe and is best known for being an origin of all of the formally elected Holy Roman Emperors between 1438 and 1740, as well as rulers of the Austrian Empire and...

 power, openly aided the Dutch in their war on Portugal, which was by then a dependent vassal
Vassal
A vassal or feudatory is a person who has entered into a mutual obligation to a lord or monarch in the context of the feudal system in medieval Europe. The obligations often included military support and mutual protection, in exchange for certain privileges, usually including the grant of land held...

 of Habsburg Spain
Habsburg Spain
Habsburg Spain refers to the history of Spain over the 16th and 17th centuries , when Spain was ruled by the major branch of the Habsburg dynasty...

.

Excerpt

An excerpt of the treaty is given below:

"In the first place we settle and covenant that there shall be from this day forward... true, faithful, constant, mutual and perpetual friendships, unions, alliances, and needs of sincere affection, and that as true and faithful friends we shall henceforth, reciprocally, be friends to friends and enemies to enemies, and shall assist, maintain, and uphold each other mutually, by sea and by land, against all men that may live and die."
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