Anglo-Portuguese Treaty of 1373 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 [and] alliances" between the two seafaring nations. It is the oldest active treaty in the world. It was confirmed "with my usual flourish" by John de Banketre, Clerk. 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
Boundary Treaty of 1881 between Chile and Argentina that older boundary treaties became obsolete and both countries agreed to submit any future disputes to the decision of a friendly third country. The law of the sea at the time of the 1881 treaty was different from the articles of the 1982 Law of the Sea, which meant that Chile and Argentina adhered to the accepted practice of a three nautical mile territorial sea. Therefore, the treaty emphasized the delineation of land boundaries including islands but did not stipulate the offshore limits, which have since been expanded to . According to the Argentine view of the treaty, called the