The Electorate of Cologne was a significant ecclesiastical principality in the Holy Roman Empire, established in the 10th century. It was ruled by the Archbishop of Cologne, who held both religious and political power. The electorate played a crucial role in the election of the Holy Roman Emperor, as one of the seven prince-electors. The capital of the electorate was the city of Cologne, known for its impressive cathedral and vibrant trade. The Electorate of Cologne was dissolved in 1803 during the secularization process, leading to the integration of its territories into the newly formed Kingdom of Prussia.