 Hugo Grotius (1583–1645) [Hugo, Huigh or Hugeianus de Groot] was a towering figure in philosophy, political theory, law and associated fields during the seventeenth century and for hundreds of years afterwards. His work ranged over a wide array of topics, though he is best known to philosophers today for his contributions to the natural law theories of normativity which emerged in the later medieval and early modern periods. This article will attempt to explain his views on the law of nature and related issues while simultaneously providing some broader assessment of his place in the history of ideas.