Adam Olearius (born Adam Ölschläger or Oehlschlaeger; 24 September 1599 or August 16, 1603 – 22 February 1671) was a German scholar, mathematician, geographer and librarian. He became secretary to the ambassador sent by Frederick III, Duke of Holstein-Gottorp, to the Shah of Safavid (Iran), and published two books about the events and observations during his travels.
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