Poland-Lithuania
The Poland-Lithuania Commonwealth, officially known as the Commonwealth of Two Nations, was a dual state formed in 1569. It united the Kingdom of Poland and the Grand Duchy of Lithuania, creating one of the largest and most populous countries in Europe at the time. The Commonwealth was characterized by a unique political system that allowed for a degree of autonomy for both nations.
The Commonwealth lasted until the late 18th century, when it was gradually partitioned by neighboring powers, including Russia, Prussia, and Austria. Despite its dissolution, the legacy of the Poland-Lithuania Commonwealth continues to influence the cultural and historical identities of both Poland and Lithuania today.