🌊Hugo Grotius
Original nameHugo Grotius
"Father of international law," author of On the Law of War and Peace
Those Who Carved the Rules Down · Lawgivers & Codes
International LawNatural LawThe NetherlandsSovereignty
Who they are
A Dutch jurist and thinker, revered as the "father of international law." In an age when Europe was torn by the brutal Thirty Years’ War, he wrote On the Law of War and Peace, arguing that even between nations, even in war, there exists a legal constraint grounded in human reason and transcending any sovereign — when it is just to go to war, and what acts are forbidden in war, should have rules. He extended Cicero’s "natural law" from the individual to relations between states, laying the first framework for modern international relations, the law of war, and humanitarian law.
Primary sourcesGrotius, On the Law of War and PeaceThe Free Sea
Key stories
Escaping Prison in a Book Chest
Grotius, caught up in a political struggle, was sentenced to life imprisonment. His wife devised a scheme: to hide him inside the large chest used to carry books to and from the castle, fooling the guards and carrying him out with the "books." The man who would one day give the whole world a body of law first saved his own life with a book chest — and in exile went on to write the founding work of international law.
Echoes today
Below are how modern works borrow or reinterpret this name or story — not the original material. The two differ, so keep them apart.
"Father of international law"Grotius extended natural law to relations between states, laying the framework for modern international law, the law of war, and humanitarian law, and remains the intellectual ancestor of international relations and international law.