It was during his sojourn in Hamburg in 1633, eight years after the publication of his "_De Jure_," and while he was still suffering from painful pecuniary embarrassment, that Europe suddenly awoke to a sense of his importance; and, almost at one time, Poland, Denmark, Spain, England, and Sweden all extended friendly invitations urging him to enter into their public service. His fame as a jurist had become international and, rudely repelled by his native Holland, he became the center of European interest. Gustavus Adolphus had placed the work of Grotius along side his Bible under his soldier's pillow, as he prosecuted his campaigns in the Thirty Years' War. The first edition of that work, written in Latin, the cosmopolitan language of learned Europe, had been quickly exhausted and widely scattered. Another had soon been called for at Paris, but the death of Buon, the publisher, created obstacles to its appearance. A second edition had appeared at Frankfort in 1626, another at Amsterdam in 1631, and still another with notes by the author in 1632. The book had aroused the thought of kings as well as of scholars, and in the circles of high influence everywhere in Europe the name of Grotius had become well known. His book had excited the most opposite sentiments and awakened the most contradictory judgments, but among lawyers and statesmen its reception was from the first generally marked by admiration. In spite of exile, poverty, and misfortune, Grotius had become a European celebrity and was about to enter into the reward of his labors. He had created a code for war and a programme of peace, and henceforth no statesman could afford to neglect him. Gustavus Adolphus, the king of Sweden, before his death on the battlefield of Lützen, had commended Grotius to his great Chancellor, Oxenstiern. By the death of Gustavus the Chancellor had, in 1633, recently come into the regency of the kingdom at a critical moment when a retreat from the bitter contest with the Empire seemed to be foredoomed unless prevented by the support and friendship of France. Recalling the commendation of the late king, Oxenstiern sought and found in Grotius an ambassador of Sweden to negotiate a new Franco-Swedish alliance. Accepting this appointment in 1634, Grotius arrived at Paris on his diplomatic mission on March 2d, 1635.