One of the main residences of the Ducal House of Reuss
Birthplace of Martin Luther
Site of a major battle in the Thirty Years' War
First capital of unified Germany
Answer
Gera has historical significance as being one of the main residences of the Ducal House of Reuss and subsequently the capital of the Principality of Reuss-Gera (1848-1918) and of the People's State of Reuss (1918-1920).
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