AT THE END of the 16th century, Brandenburg and Prussia were unimportant German lands, but the ruler of Brandenburg was clever and farsighted. He was John Sigismund, the head of the Hohenzollern family. In 1594 John Sigismund married the daughter of the idiot duke of Prussia. In 1618, when the duke died, John Sigismund became ruler of Prussia as well as Brandenburg. There must have been many people who laughed at John Sigismund. Brandenburg was worth little, they must have thought, so why did he want an even less valuable Prussia. The nobles were the real power in both Prussia …
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