To What Extent Were St. Augustine's Just War Principles Used In The First Crusade?

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Not at all directly, as that would be a bit of an anachronism.

While the term "just war", and the basic idea behind the concept belong to Augustine, what are known today as the principles of it were actually laid out initially by Thomas Aquinas in 1274 in his Summa Theologica, and have been greatly expanded over the years into the theory we know today.

The First Crusade was in 1096-1099, and was promoted by Pope Urban II in 1095. That's nearly two centuries earlier.

Its a pretty good bet Aquinas knew about it and later Crusades, and factored what he knew of them into his thinking when coming up with his three conditions for a "just" war. So if anything, the relation between Just War Theory and the First Crusade goes the other way.

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First of all, none of the accounts of Pope Urban II's speech were contemporaneous or detailed, so nobody knows exactly what he said at all. Moreover, the existing summaries differ significantly from each other. None of the summaries mention St. Augustine at all.

The tone of the summaries is not very theoretical. The question seems founded on the idea that the Crusade was some kind of United Nations deliberation featuring long-winded theoretical debates. That is not the way it went down. Basically the Pope just invited a bunch guys over, said "Take back Jerusalem! Anybody that does it will go to heaven!" He was not trying to "justify" anything. In medieval times, nobody in Europe needed any "justifications".

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