§ 125. During antiquity, prisoners of war could be killed, and they were very often at once actually butchered or offered as sacrifices to the gods. If they were spared, they were as a rule made slaves and only exceptionally liberated. But belligerents also exchanged their prisoners or liberated them for ransom. During the first part of the Middle Ages prisoners of war could likewise be killed or made slaves. Under the influence of Christianity, however, their fate in time became mitigated. Although they were often most cruelly treated during the second part of the Middle Ages, they were not as a rule killed and, with the disappearance of slavery in Europe, they were no longer enslaved. By the time modern International Law gradually came into existence, killing and enslaving prisoners of war had disappeared, but they were still often treated as criminals and as objects of personal revenge. They were not considered in the power of the State by whose forces they were captured, but in the power of those very forces or of the individual soldiers that had made the capture. And it was considered lawful on the part of captors to make as much profit as possible out of their prisoners by way of ransom, provided no exchange of prisoners took place. So general was this practice that a more or less definite scale of ransom became usual. Thus, Grotius (III. c. 14, § 9) mentions that in his time the ransom of a private was the amount of his one month's pay. And since the pecuniary value of a prisoner as regards ransom rose in proportion with his fortune and his position in life and in the enemy army, it became usual for prisoners of rank and note not to belong to the capturing forces but to the Sovereign, who had, however, to recompense the captors. During the seventeenth century, the custom that prisoners were considered in the power of their captors died away. They were now considered to be in the power of the Sovereign by whose forces they were captured. But rules of the Law of Nations regarding their proper treatment were hardly in existence. The practice of liberating prisoners in exchange, or for ransom only, continued. Special cartels were often concluded at the outbreak of or during a war for the purpose of stipulating a scale of ransom according to which either belligerent could redeem his soldiers and officers from captivity. The last[256] instance of such cartels is that between England and France in 1780, stipulating the ransom for members of the naval and military forces of both belligerents. [Footnote 256: See Hall, § 134, p. 428, note 1.]