THE RIGHTS OF WAR AND PEACE  by Hugo Grotius is famous work on the law of war.

“De Jure Belli ac Pacis” (1625; On the Law of War and Peace) is considered one of the greatest contributions to the development of international law.
Also a statesman and diplomat, Grotius has been called the “father of international law.”

Grotius’s Rights of War and Peace is a classic of modern public international law which lays the foundation for a universal code of law and which strongly defends the rights of individual agents - states as well as private persons - to use their power to secure themselves and their property.