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In page Albrecht Giese:

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Giese was born in Danzig, in the Kingdom of Poland, to the influential and wealthy merchant Patrician family Giese (or Gisze). The Giese family had emigrated from Unna, near Giesen, Cologne in 1430.[1] They were part of the Hanseatic League, that had come to dominate European trade in the 14th and 15th-centuries.[citation needed] The Giese family maintained offices in London, at the Steelyard, where Hanseatic and foreign merchants congregated and his sons appear to have managed the London branch.[2]