ABSTRACT Studying the military thinking and military history of the Middle Ages, one can observe several forms of warfare ideologies. Three of these ideologies are the holy war ideology, the ideology of ordeal (or iudicium Dei), and the traditional just war theory. Every such ideology has the common characteristic of a stronger or weaker link to concepts of a Christian God, religion, or church. Beyond this common characteristic, the ideologies differ from each other in some key respects. The holy war ideology applies first and foremost the concept of God, traditional just war theory applies the concept of justice, and the ideology of ordeal relies on both the concepts of God and justice. This article presents the ideology of ordeal as a form of just war thinking, and describes its features through historical examples, through its essence, and in contrast to other ideologies.
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