The Spaniards, as is well known, then claimed the Pacific Ocean and the Gulf of Mexico, and Portugal claimed, in like manner, the Atlantic south of Morocco and the Indian Ocean, and both nations, at this time under a common sovereign, claimed and sought to exercise the right of excluding all foreigners from navigating or entering these waters. The Dutch, then at war with Spain, although not technically at war with Portugal, established themselves in 1598 in the island of Mauritius. Shortly thereafter they made settlements in Java and in the Moluccas. In 1602 the Dutch East India Company was formed, and, as it attempted to trade with the East Indies, its vessels came into competition with those of the Portuguese engaged in the Eastern trade, which sought to exclude them from the Indian waters. One Heemskerck, a captain in the employ of the Company, took a large Portuguese galleon in the Straits of Malacca. To trade with the East Indies was one thing, to capture Portuguese vessels was quite another thing. Therefore, some members of the Company refused their parts of the prize; others sold their shares in the company, and still others thought of establishing a new company in France, under the protection of King Henry IV, which should trade in peace and abstain from all warlike action. The matter was therefore one of no little importance, and it appears that Grotius was consulted and wrote his treatise on the law of prize, which is in the nature of a brief and is, at any rate, a lawyer’s argument.[D] In 1608 Spain and Holland began negotiations which, on April 9, 1609, resulted in the truce of Antwerp for the period of 12 years, and, in the course of the negotiations, Spain tried to secure from the United Provinces a renunciation of their right to trade in the East and West Indies. The Dutch East India Company thereupon, it would appear, requested Grotius to publish that part of his brief dealing with the freedom of the seas. This was done under the title of _Mare Liberum_, with such changes as were necessary to enable it to stand alone.