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The law of war is usually divided into jus ad bellum (the right to resort to war) and jus in bello (the law during war). The concept of war crimes encompasses those violations of the laws of war that involve individual criminal responsibility. The terms international humanitarian law, laws of war, laws of armed conflict, and rules of war are generally interchangeable. Human rights groups and relief organizations such as the International Committee of the Red Cross tend to prefer international humanitarian law, whereas militaries typically prefer the term laws of war or international war crimes. In some contexts the term international war crimes has come to include crimes of aggression, crimes against humanity, and grave breaches of the 1949 Geneva Conventions.

The common element of all international crimes is that they entail individual responsibility. Ordinarily, violations of international human rights norms could lead to requiring the offending state to make some form of reparation. These international war crimes, however, require individual accountability, regardless of state responsibility.

Early Conceptual Development

The concept of war crimes has a long history and spans many cultures. The Greeks and Romans forged rules for the treatment of the wounded and of prisoners. The Chinese author Sun Tzu, writing in the fourth century BCE in The Art of War, surveyed the custom of sparing the wounded and elderly and developed a concept of command responsibility for violations. In the Hindu code of Manu (circa 200 BCE), the notion of war crimes per se appeared more fully. Academics have traced systems of rules for regulating the practice of war through several centuries, as in the various samurai codes in Tokugawa Japan and the practice of chivalry in medieval Europe. St. Augustine, among other early Christian theologians, discussed the idea of just war in his treatise City of God.

The first prosecution for initiating an unjust war reportedly occurred when Conradin von Hohenstaufen was convicted and executed in Naples in 1268. Hohenstaufen was tried by his own nation's court for violations of the law of his country. The first true trial of an international nature for war crimes is generally considered to be that of Peter von Hagenbach, who was tried in Breisach, Germany, in 1474. Hagenbach, the appointee of Duke Charles of Burgundy, was tried for atrocities committed in an attempt to subdue Breisach by force. Presiding were 27 judges of the Holy Roman Empire, each representing a member state or unit of the Empire. Hagenbach was found guilty and sentenced to death for wartime atrocities of murder, rape, perjury, and other crimes committed by his troops against civilians.

Gradually, observing certain restraints during warfare became such a widespread practice that these restraints became usages or customs of warfare. By 1625, such rules had become sufficiently widely accepted that Hugo Grotius, considered the founder of modern international law, was able to collect various historical writings on these customs and usages in a treatise called The Law of War and Peace. Although he was concerned with the barbarism of war, Grotius's focus was on the use of just war as an instrument of law; thus, he challenged the concept of war as an extralegal affair.

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