Hugo Grotius, a Dutch jurist, is widely regarded as the father of modern international law for his seminal work, 'De Jure Belli ac Pacis' (On the Law of War and Peace), published in 1625.

The primary goal of the Law of Nations is to promote peace and prevent war by establishing rules and principles for peaceful coexistence and resolving disputes among nations.

Sovereignty, the right of a state to govern itself without external interference, is a fundamental principle in the Law of Nations. It recognizes the independence and equality of all states.

The doctrine of 'just war' in the Law of Nations encompasses all of the above criteria. It requires a just cause, such as self-defense or the protection of innocent lives, as well as the use of just means, such as proportionality and discrimination.

The principle of 'pacta sunt servanda' in the Law of Nations emphasizes the sanctity of treaties and agreements between states. It requires states to fulfill their obligations and commitments in good faith.

International organizations, such as the United Nations, play a crucial role in the Law of Nations by promoting cooperation among nations, resolving disputes peacefully, and maintaining international peace and security.

The non-aggression principle is a fundamental principle in the Law of Nations that prohibits the use of force or the threat of force in international relations, except in cases of self-defense or when authorized by the United Nations Security Council.

The concept of 'state responsibility' in the Law of Nations encompasses all of the above obligations. It requires states to respect the rights of other states, make reparations for wrongful acts, and prevent harm to other states.

Territorial jurisdiction is a principle in the Law of Nations that allows states to exercise jurisdiction over their territory and nationals. It is based on the idea that states have the right to govern and regulate their own affairs within their borders.

The principle of 'uti possidetis' in the Law of Nations refers to the principle of maintaining the status quo, or the existing territorial boundaries and political arrangements, at the time of a particular event or agreement.

The principle of 'terra nullius' in the Law of Nations allows states to claim sovereignty over uninhabited territories that are not under the control of any other state.

The concept of 'crimes against humanity' in the Law of Nations refers to serious violations of human rights, such as murder, torture, and enslavement, that are committed against a particular group of people on a widespread or systematic basis.

The principle of 'piracy jure gentium' in the Law of Nations prohibits piracy and other acts of violence on the high seas, which are considered to be crimes against all nations.

The doctrine of 'self-defense' in the Law of Nations allows a state to use force to defend itself against an armed attack or an imminent threat of an armed attack.

The non-recognition principle in the Law of Nations prohibits the acquisition of territory by force or other illegal means, such as aggression or occupation. It requires states to refrain from recognizing or accepting the legitimacy of such territorial acquisitions.