Augustine got the Just War ball rolling in the late 4th Century by outlining three kinds of wars he believed God’s people can support. And his theories were not changed for the most part but instead grew in popularity among Catholics.
Then along came Thomas Aquinas 900 years later, in the 13th Century (1225-1274), to spearhead… 
Series Archive: ‘Just War: From Augustine To George W. (In Progress)’
Just War Part 3: Aquinas Builds
Just War Part 2: The Theory Of Augustine
In Augustine’s theory, three kinds of war were morally defensible: a defensive war against aggression, a war to gain just reparations for previous wrong, and a war to recover stolen property.(1) There may be biblical foundations for Augustine’s deciding only to accept these three kinds of wars, or to accept any war at all,… 


