De Jure Belli is a Latin term meaning "on the right of war." It refers to the legal and moral principles that govern the justification for engaging in war. This concept is often discussed in the context of international law and ethics, determining when it is permissible for a state to resort to armed conflict. The principles of De Jure Belli are closely related to the ideas of Just War Theory, which outlines the conditions under which war can be justified. These principles help to ensure that wars are fought for legitimate reasons, such as self-defense or protecting human rights, rather than for aggression or conquest.