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How did Cologne become a free imperial city?

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Cologne The Hohenzollern rail and pedestrian bridge over the Rhine River, Cologne, Germany, with the city's cathedral in the background.

Cologne achieved the status of a free imperial city by securing independence from the temporal authority of its archbishop through force of arms.12

During the Middle Ages, the city’s growing merchant class engaged in increasingly bitter conflicts with the archbishop, who sought to maintain control over tolls and customs duties. This struggle culminated in the Battle of Worringen in 1288, where the archbishop was defeated, allowing the city to secure full self-government.1

While Cologne functioned as a free imperial city following this victory, it did not receive official recognition of this status until 1475. As a free imperial city, Cologne was subject only to the authority of the emperor, distinguishing it from other towns that remained under the control of ecclesiastical or secular lords.12