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Johann Martin Lappenberg (born July 30, 1794, Hamburg [Germany]—died Nov. 28, 1865, Hamburg) was a German archivist who was also a prolific scholar of German and English history. Lappenberg was intended for his father’s profession, medicine, and studied in Edinburgh and London, where he conceived the ambition of entering British politics or serving in that country’s diplomatic service. He therefore studied law at the universities of Berlin and Göttingen but became convinced after visiting Britain...