The Anglo-Portuguese Alliance is one of the oldest military alliances in the world, dating back to 1373. It was established between the Kingdom of England and the Kingdom of Portugal to provide mutual support against common enemies. This alliance has played a significant role in various historical conflicts, including the Iberian Union and the Napoleonic Wars. Throughout the centuries, the alliance has been reaffirmed through treaties and diplomatic relations, highlighting the strong ties between the two nations. The alliance has also facilitated trade and cultural exchange, contributing to the development of both British and Portuguese societies.