The Moroccan-American Treaty of Peace and Friendship, sealed by Sultan Mohammed III.
The signing of the Geneva Conventions in 1949. A country’s signature, through plenipotentiaries with "full power" to conclude a treaty, is often sufficient to manifest an intention to be bound by the treaty.
The International Court of Justice is often called upon to aid in the interpretation or implementation of treaties.
A treaty delegation of the Mdewakanton and Wahpekute indigenous tribes to Washington, D.C. (1858).

Sources of international law include treaties, international customs, general widely recognized principles of law, the decisions of national and lower courts, and scholarly writings.

- Sources of international law

Along with general principles of law and treaties, custom is considered by the International Court of Justice, jurists, the United Nations, and its member states to be among the primary sources of international law.

- Customary international law

Treaties serve as primary sources of international law and have codified or established most international legal principles since the early 20th century.

- Treaty

Notwithstanding the Law of Treaties and customary international law, treaties are not required to follow any standard form.

- Treaty
The Moroccan-American Treaty of Peace and Friendship, sealed by Sultan Mohammed III.

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The Hittite version of the Treaty of Kadesh, among the earliest extant examples of an international agreement.

International law

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Set of rules, norms, and standards generally recognized as binding between nations.

Set of rules, norms, and standards generally recognized as binding between nations.

The Hittite version of the Treaty of Kadesh, among the earliest extant examples of an international agreement.
Hugo Grotius' De jure belli ac pacis, is considered one of the foundational texts of international law. (Pictured is the title page from the second edition of 1631).
A portrait of the Dutch jurist Hugo Grotius (alias Hugo de Groot)
Sir Alberico Gentili is regarded as the Father of international law.
The First Geneva Convention (1864) is one of the earliest formulations of international law

The sources of international law include international custom (general state practice accepted as law), treaties, and general principles of law recognized by most national legal systems.