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When did Berlin become the royal residence city of Prussia?
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Berlin
The Brandenburg Gate, Berlin.
Berlin became the royal residence city of Prussia under Frederick I, who was crowned the first Prussian king in 1701.1
While the Hohenzollern dynasty had established Berlin-Kölln as their capital and permanent residence as electoral princes of Brandenburg starting in the late 15th century, it was Frederick I who elevated the city to its status as a royal residence following his coronation in Königsberg.1