 Whatever the merits of the DIP, it is on the DIB that the bulk of Grotius’ reputation rests. It consists of an introduction and three books, totaling more than 900 pages in translation. As with DIP, the introduction or “Prolegomena” holds the greatest interest for philosophers, for it is here that Grotius articulates and defends the philosophical foundations of the DIB. While philosophers are naturally attracted to the “Prolegomena”, the body of the DIB is also redolent with themes of philosophical interest. Book One defines the concept of war, argues for the legitimacy of war, and identifies who may legitimately wage war. Book Two deals with the causes of war, the origins of property, the transfer of rights and more, while Book Three is dedicated primarily to the rightful conduct of belligerents in war. After the initial publication in 1625, Grotius ushered several more editions to press during his life, each time adding more references without substantially changing the arguments. (A word of explanation about citations to the DIB they commonly take the form of book, chapter, section and—where applicable—paragraph; so, “I.1.10.1” means “Book One, Chapter One, Section Ten, Paragraph One”.)