In international relations, the Anglo-Portuguese Alliance, signed in 1373 between the Kingdom of England (succeeded by the United Kingdom) and Portugal, is the oldest alliance in the world which is still in force.
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.”
image: An illuminated manuscript miniature, c.1430-40, of Edward III of England. The king is wearing a blue mantle, decorated with the Order of the Garter, over his plate armour.