The Rights of War and Peace (De Jure Belli ac Pacis)

The Rights of War and Peace is Hugo Grotius’s De Jure Belli ac Pacis (1625), conventionally regarded as the founding work of modern international law and a pivotal moment in the natural-law tradition: the point at which natural law is detached from theology and re-grounded in reason and human nature.

The Secularizing Move

Grotius locates the source of natural law in the rational and social nature of man (appetitus societatis, the desire for ordered society) rather than in divine command alone. The famous formulation comes in the Prolegomena (§11): natural law would retain its validity etiamsi daremus non esse Deum — even if we were to grant, what cannot be granted without the utmost wickedness, that there is no God or that he takes no care of human affairs. Grotius does not deny God; he argues that natural law’s content is so rooted in human nature that it would bind regardless. This makes natural law a common standard across confessional lines — exactly what post-Reformation Europe, tearing itself apart in religious war, needed.

Natural Right, Property, and Just War

From this foundation Grotius derives a body of natural rights — to self-preservation, to property, to the keeping of promises (pacta sunt servanda) — and builds the law of nations on it: rules governing when war may justly be waged (just cause, proper authority) and how it must be limited (restraint toward non-combatants, good faith in agreements). His insistence that obligations bind sovereigns, not merely subjects, and that there is a law above the will of any prince, is the natural-law tradition applied to relations between states.

Place in This Wiki

Grotius stands between Aquinas and Locke in the lineage. He inherits the Scholastic natural-law apparatus, strips it of its dependence on revealed theology, and hands a rights-and-contract version of it to the later natural-rights theorists Locke draws on. He is a theorist of obligation and a defender of property and promise-keeping, not a libertarian or an anti-statist; the wiki uses him for the secularization that made natural rights a portable, cross-cultural standard.

See Also

• Hugo Grotius - author reference
• Natural Law and Natural Order - the tradition this text secularizes
• Treatise on Law - the Scholastic natural law Grotius inherits and secularizes
• Second Treatise of Government - Locke’s rights theory downstream of Grotius
• School of Salamanca - Vitoria’s natural-law school, the parallel founder of international law
• The Whole Duty of Man According to the Law of Nature - Pufendorf’s systematization of Grotius’s secularized natural law

Sources

• Grotius, The Rights of War and Peace (Full Text) - Prolegomena (the etiamsi daremus argument; natural law from human sociality) and Book I (natural right, just cause, the law of nations); Campbell translation, Hill introduction