This article examines Grotius' lifelong support for Dutch expansion overseas. As noted in other publications of mine, Grotius cooperated closely with the directors of the Dutch East India Company (VOC) in the years 1604-1615. Right up to his arrest for high treason in August 1618, he contributed towards Dutch government discussions about the establishment of a West India Company (WIC). Three years of imprisonment at Loevestein Castle and, following his escape, long years of exile could not weaken his dedication to the cause. His relatives in Holland, in particular his brother Willem de Groot and his brother-in-law Nicolaas van Reigersberch, kept him up-to-date on the fortunes of the VOC and WIC. His expertise on maritime affairs was in high...