Hugo Grotius was studying the laws of nations at the same time as Locke; and in him the very same methods may be found as those already mentioned, inasmuch as he also falls into a quite empirical system of associating nations with one another, combining with that an empirical mode of reasoning. Hugo van Groot, born 1583 at Delft, was a lawyer, fiscal general, and council pensionary; in 1619, however, he was implicated in the Barneveldt trial, and was compelled to fly the country. For a long time he remained in France, but in 1634 he entered the service of Queen Christina of Sweden. In 1635 he was made Swedish ambassador in Paris, and in 1645 he died at Rostock, while on a journey from Stockholm to Holland.[230] His principal work, _De jure belli et pacis_, he composed in 1625; now it is not read, but at one time it exercised a very great and important influence. In it Grotius presented a comparative historical account, the material of which was partly derived from the Old Testament, of the manner in which nations in the various relationships of war and peace have acted towards one another, and what usages they held to be binding. The following may serve as an example of his empirical method of reasoning: Prisoners ought not to be killed; for the object is to disarm the enemy, and if this end be attained nothing further should be done.[231] This empirical way of connecting facts had the effect of bringing general comprehensible and rational principles into consciousness, of making them recognized, and of causing them to be more or less acceptable. Thus we see principles set forth, respecting the righteousness of a king’s power for instance; for thought applied itself to everything. We are unsatisfied by such proofs and deductions, but we must not overlook what is thereby accomplished; and this is the establishment of principles which have their ultimate confirmation in the objects themselves, in mind and thought. 3. THOMAS HOBBES.