Brandenburg is a state in the northeast of Germany. Brandenburg surrounds but does not include Berlin.
The earlier Margraviate of Brandenburg was a major principality of the Holy Roman Empire. In the 15th century, it came under the rule of the House of Hohenzollern, which later also became the ruler of the Duchy of Prussia and established Brandenburg-Prussia, the core of the later Kingdom of Prussia. From 1815 to 1947, Brandenburg was a province of Prussia.
Brandenburg an der Havel is a town in Brandenburg, which served as the capital of the Margraviate of Brandenburg until replaced by Berlin in 1417.