Anglo-Portuguese relations refer to the long-standing diplomatic and historical ties between England (later Great Britain) and Portugal. These relations date back to the Treaty of Windsor in 1386, which established a military and political alliance that has endured through various conflicts and changes in Europe. The two nations have cooperated in trade, exploration, and military endeavors over the centuries. The alliance was particularly significant during the Age of Exploration, when both countries sought new trade routes and territories. Their partnership also played a crucial role during the Napoleonic Wars, as Britain supported Portugal against French invasions. Today, the relationship continues to thrive through cultural exchanges and economic cooperation within the European Union.