Union of Lublin

The Union of Lublin, established in 1569, was a significant agreement between the Kingdom of Poland and the Grand Duchy of Lithuania. This treaty created a single state known as the Polish-Lithuanian Commonwealth. It aimed to strengthen both regions against external threats, particularly from Russia and Sweden. The Union brought together their political systems, armies, and economies while allowing each to maintain its own laws and customs. This alliance lasted until the late 18th century and was crucial in shaping the history, culture, and politics of Central and Eastern Europe.