Abstract
The article examines argument based on Roman law in Chapter V of Hugo Grotius' Mare liberum, sive de iure quod Batavis competit ad indicana commercia dissertatio. This short treatise, constituting in fact an extra from a larger work known as De iure praedae commentarius, not published during Grotius' lifetime, is an excellent example of how new normative solutions can be developed on the basis of existing legal institutions. Some of these institutions, despite having been developed as a part of the ancient Roman law, were treated by Grotius as having their origins in natural law (ius naturale), or the law of nations (ius gentium). The reference to natural law certainly facilitated the transposition of institutions that had historically fitted into the framework of private law (ius privatum) into the realm of public law (ius publicum). This tendency was one of the key factors in development of the early modern concept of ius gentium. Hence, the analysis covers the intitutions and concepts invoked by Grotius, such as, in particular, occupatio, res publicae, and res omnium communes. Their use is a proof of the realism of Grotius, who creatively applied the intitutions of Roman private law to public juridiction over the seas.
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