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Global Ethics

Just War: jus ad bellum, jus in bello and jus post bellum

  • 3 things to know
  • A2

Overview

Purpose of Just War theory, three conditions Aquinas gives for a just war and jus ad bellum.

What you need to know

Answer each one before you reveal it.

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Key term

Name the two central principles of jus in bello.

Key term

What is the purpose of Just War theory?

Key term

Which thinkers shaped the origins of the Just War tradition?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the purpose of Just War theory?

    Model answer

    Just War theory sets conditions intended to limit both the occasions of war and the conduct of war, on the assumption that war is sometimes unavoidable but always a great evil.

  2. 2

    Which thinkers shaped the origins of the Just War tradition?

    Model answer

    Augustine gave the tradition its Christian foundation, Aquinas set out its conditions systematically, and later writers such as Vitoria and Grotius developed it into a body of international law.

  3. 3

    State the three conditions Aquinas gives for a just war.

    Model answer

    Aquinas requires the authority of the sovereign, a just cause, and a right intention aiming at the advancement of good or the avoidance of evil.

  4. 4

    Define jus ad bellum.

    Model answer

    Jus ad bellum is the body of conditions governing whether it is right to go to war at all.

  5. 5

    Name four conditions of jus ad bellum besides just cause.

    Model answer

    The further conditions are legitimate authority, right intention, last resort, reasonable prospect of success and proportionality of the war as a whole.

  6. 6

    Define jus in bello.

    Model answer

    Jus in bello is the body of conditions governing how a war may lawfully and rightly be fought once it has begun.

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