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Just War (''jus ad bellum'') is a doctrine of war which teaches that a war is not valid unless it is just, meaning it is defensive in nature either reclaiming things stolen or to castigate an offending person.

Just War Theory consists of two primary competent, first determining if a war may be justly conducted (''jus ad bellum'') and how it must be conducted (''jus in bello'').

 

 

== ''Jus ad bellum'' - Is a war just? ==

 

Under ''jus ad bellum'', only legitimate authorities can wage war for the right reasons (usually this means a defensive war) and only as a last resort if every other peaceful means to avert war have been used to no avail.

Under ''jus ad bellum'', only legitimate authorities can wage war for the right reasons (usually this means a defensive war) and only as a last resort if every other peaceful means to avert war have been used to no avail.