The "Institutes of Justinian", echoing the "Commentaries" of Gaius, says that "All nations ... are governed partly by their own particular laws, and partly by those laws which are common to all, that natural Reason appoints for all mankind." Expanding on the classical understanding of universal law accessible by reason, in the seventeenth century, the Dutch jurist Grotius laid the foundations for universal jurisdiction in modern international law, promulgating in his "Dē Jūre Prādae" ("Of the Law of Captures") and later "Dē jūre bellī ac pācis" ("Of the Law of War and Peace") the Enlightenment view that there are universal principles of right and wrong.