Public International Law
Introductory Topics

The term “international law” was first used by the English philosopher Jeremy Bentham in 1780 in his treatise entitled “Introduction to the Principles of Morals and Legislation”. Since about 1840, this term replaced the older terminology “law of nations” which can be traced back to the Roman concept of “ius gentium”.
International Law is divided into two branches: Private International Law (conflict of laws as it is called in the countries of the Common Law System), and Public International Law (usually just termed International Law). Private International Law deals with those cases, within a particular legal system, in which foreign elements involve, raising questions as to the application of foreign law or the role of foreign courts. Public International Law deals, in general, with the external relations of States. It is this latter branch of International Law is the subject of this present book.
What is Public International Law? How is it originated and developed? What is the aim it is trying to achieve?
The answers to all these raised questions are dealt with in the following sections.

I. Definition of Public International Law
Until the Second World War, legal scholars found no difficulty in defining “Public International Law”, in one formation or another, as the law that governs the relations between States. This traditional definition is a reflection of the prevailing doctrine of the nineteenth century and the first half of the twentieth century considering that only states could be persons (subjects) of Public International Law, in the sense of enjoying international legal personality, i.e., being capable of possessing international rights and duties.
However, since the mid-twentieth century, the traditional definition has become controversial due to both the expansion of the scope of the Public International Law into new areas and the emergence of new actors, beside states, on the international scene, such as international organizations, multinational corporations, individuals and groups, including minorities and indigenous peoples. Some of these actors have acquired international legal personality, or, at least, certain rights under International Law.
In the light of this development, the traditional definition has become incomprehensive description of this law, and the change of the definition of the Public International Law has become inevitable. Public International Law has been defined as a body of legal rules which regulates or governs relations between international persons (subjects). This contemporary definition of Public International Law goes beyond the traditional one which defines this law as a body of rules governing relations between states.

Thus, the contemporary Public International Law consists of the following:

(a) Legal rules of conduct which states feel themselves bound to observe in their relations with each others;

(b) Legal rules related to the functioning of international organizations, their relations with each other and their relations with States and individuals; and

(c) Legal rules related to individuals and non-state entities as far as the rights and duties of these subjects are the concern of the international community.

Public International Law now covers vast and complex areas of international concern, including traditional topics, such as the State, peace and security, the laws of war, the laws of treaties, the law of the sea, the law of diplomatic and consular relations, as well as new topics, such as international organizations, economy and development, air law and outer space activities, communications, the environment, and last but not least, human rights.
The rules of Public International Law are general and universal in their nature, and are legally binding on all the persons of International Law. These rules must be distinguished from what is called international comity and what is known as international morality. A comity is a friendly gesture or courtesy exercised by one State toward another without constituting a legal obligation; an example of a comity is the flag salute at the sea. A comity helps in promoting and maintaining friendly relations among States. While not a legal rule, a comity can be widely observed and can evolve into a customary international rule or be codified as a law; an example of an international comity which was codified as a law is the exemption from customs duties of personal articles used by diplomats (codified in the Vienna Convention on Diplomatic Relations of 1961).

Rules of International Law may meet at certain points with principles of international morality since they cannot be divorced from their moral values. However, the former rules are legal in their contents and forms, while the principles of morality are part of the discipline of ethics which is not legally binding.

II. Origin and Development of Public International Law
The foundations of Public International Law as it is understood today lie firmly in the development of political relations between the Western European States some 400 years ago. However, certain basic concepts of this Law can be traced back thousands of years ago, in relations between ancient political entities, such as of the Near East, Greece and Persia.
The structure and development of Public International Law is connected with the era of sovereign national States dealing with each other as independent entities. In this sense, therefore, the history of this Law can be regarded as beginning in the 16th Century with the emergence of independent nation-states from the ruins of the medieval Holy Roman Empire which was based on the claims to universal authority of the Pope as the spiritual, and the Emperor as the temporal, head of Christian nations of Europe. As this Empire disintegrated, a growing number of independent and equal States filled the gap.
The Emergence of independent and equal States subject to no temporal superior authority led to new political theories.The most prominent among these theories was the theory of Sovereignty. This theory was explicitly formulated by Jean Bodin (1530-1596) in his treatise entitled Six Livres de Republique (Six Books on the Republic) of 1576. According to Bodin, in every State there exists in an individual monarch a power called sovereignty (majesties). Sovereignty is a Republic absolute and perpetual power. It is absolute because it is indivisible; however, it is not without any limits. While such a sovereign is not bound by the laws himself instituted, he remains bound by the divine law, the law of nature, and the law of nations. Sovereignty is perpetual because it does not disappear with its holder (the sovereign). The concept of sovereign as supreme legislator, as formulated by Bodine, was in the course of time evolved into the principle which gave the State supreme power vis-à-vis other States.
The coexistence of independent sovereign States led to the development of the system of interstate relations. The need for rules regulating the intercourse between the newly emerging States in Europe stimulated these States to draw mainly upon the Roman Law and the Cannon Law (the Law of Roman-Catholic Church) for the sources of such rules. The significance of the Roman Law and the Cannon Law contribution to “the law of nations” lies not only in the development of a modern system of interstate legal relations, but also in the development of many principles of general equity and “natural law” some of which are similar to certain general principles of law recognized by civilized nations.
In the few centuries that preceded the Thirty Years War (1618-1648), the intensification of international trade, and the improvements in navigation and military techniques, and the discovery of many distant lands by the European States stimulated further development of international practices and the emergence of new conceptions of the law of nations. The intensification of trade led to the conclusion of many commercial treaties and the emergence of new practices and principles related to the law of merchant and the maritime law. Notably, the growth of international trade had from the 8th Century onwards led to the development of international law of merchant and, in particular, to various compilations of maritime law which gained increasing international recognition. The international customs and principles related to the law of merchant and maritime constituted part of the practices and principles of “the law of nations.”
The discovery and subjugation of distant lands and peoples by European States produced numerous conflicting claims of sovereignty, jurisdiction, rights of trade and rights of navigation as well as problems of relations. All these developments urged the Europeans to resort to the Roman Law for helpful norms or analogies, and consequently led to new practices and principles.
By the 17th Century, the growing complexity of international principles, customs and treaties had given rise to their compilation and to the development of further rules governing the conduct of States in time of war and peace. The most important treatise, dealing with States’ relations in time of war and peace, of this period was “De Jure Belli Ac Pacis” (On the Law of War and Peace), published in 1625 by the Dutch jurist and diplomat Hugo Grotius (1583-1645).[13] Hugo Grotius is recognized as the “Father of International Law”, and his treatise is generally regarded as providing the foundation of the Public International Law.
Beside Grotius, there are many jurists who contributed extensively to “the law of nations” during the 17th and the 18th centuries. Among these jurists are Francisco de Vitoria (1480-1546), Suarez (1548-1617), Alberico Gentili (1552-1608), Samuel von Pufendorf (1632-1694), Richard Zouche (1590-1660), Johann Jacob Moser (1701-1785), Christian Wolff (1676-1754), and Emerich de Vattel (1714-1769).
The International Law (the law of nations) further expanded in the 19th Century. This expansion was due to major events such as the expansion of the European empires, the rise of powerful States both within and outside Europe, the spread of the thought of democracy and nationalism, the Industrial Revolution, the modernization of world transport, and the influence of new inventions. All these events urged the international community to develop the International Law in order to accommodate such events. Consequently, International Law as a law regulating diplomatic and commercial relations between States, and the conduct of war, multiplied and intensified during the 19th Century.
The establishment of the League of Nations in 1919, following the First World War, and the establishment of the United Nations in 1945, following the Second World War, represented two significant turning points in the development of the International Law. The development was characterized by a new departure in the evolution of this Law. International Law began its evolution from being primarily a system of regulating relations between States towards becoming also a system of international cooperation.
The League of Nations was the first international organization established primarily for the purpose of maintaining international peace and security. The establishment of the International Labor Organization (ILO), affiliated with the League of Nations, in 1919 signaled the end of an era in which International Law was, with few exceptions, confined to the regulation of relations between States. The ILO was the first permanent international organization concerned with the improvement of labor conditions and social welfare at the international level. In 1921, the Permanent Court of International Justice (PCIJ) was established as the first permanent international judicial organ with an international judicial jurisdiction.
The establishment of the United Nations in 1945 led to a progressive development of International Law. During the post-United Nations’ era, the development of International Law has been influenced by two major events effected the international community. The first major event has been the expansion in the membership of the international community. New States, mostly representing non-western civilization, have joined the club of family of nations, which was previously exclusively limited to States belonging to Western Civilization. The concerns and priorities of these States have been different from those of other States; they have been occupied with the development of their political, economic and social systems. The second major event has been the massive expansion of international organizations for cooperation. Numerous specialized agencies of the United Nations and other international organizations, universal as well as regional, have been established. This event has confirmed the evolution International Law from its traditional nature to its contemporary nature of being a system of organized collective efforts for cooperation.
Since the establishment of the United Nations, a great number of international treaties covering all aspects of international affaires have been concluded. Law-making treaties have been contributing extensively to the rapid development of Public International Law. They have led to may important new developments in Public International Law, and greatly increased both its scope. Apart of the law-making treaties, international courts, the present International Court of Justice (ICJ), its forerunner the Permanent Court of International Justice (PCIJ), and others, have been also contributing to the development of Public International Law. Moreover, the International Law Commission created in 1947, the organs of the United Nations and its specialized agencies have been playing a significant role in developing and expanding Public International Law.
In conclusion, Public International Law has evolved from being primarily a law of coexistence, which characterized it from its birth in the early 16th century to the mid 20th century, to a law of international organization and cooperation. Moreover, the most important characteristic of Contemporary Public International Law is the steady expansion of its scope through the inclusion of new subject matters formerly outside its sphere, and the inclusion of new participants and subjects such as international organizations and individuals.

III. Aims of Public International Law
The initial aim of Public International Law has been to create an orderly system of international relations. However, the modern developments of this law have added another aim to it. Since the beginning of the Twentieth Century, there has been an evidence of a tendency to bring justice into the international community through ensuring justice in the relations of States and securing justice for peoples and individuals.
The establishments of the Permanent Court of International Justice in 1921 and the International Court of Justice in 1945 have been a clear evidence of such a new aim of the Public International Law. The use of the term “justice” in the name of these international courts where disputes among States are decided and where advisory opinions are given according to Public International Law is evidence that justice has become the concern of this law, and has become one of its aims and purposes.
To ensure and secure justice, and above all, to bring order to the international relations are the primary aims of the contemporary Public International Law. This law, which regulates relations between international persons, aims to create a system of order and justice for the international community. In the absence of such a system, it will be impossible for the international persons to have steady and continuous relations, and to enjoy the benefits of such relations.

References:
[1] P. Malanczuk , Akehurst’s Modern Introduction to International Law, p. 1, 7th rev. ed., Routledge, New York (1997); and see R. Bledsoe and B. Boczek, The International Law Dictionary, p. 13, Clio Press, Oxford (1987).
[2] M. N. Shaw, International Law, pp. 1-2, 5th ed., Cambridge (2003).
[3] See Malanczuk, p. 1
[4] Id.
[5] See generally D. J. Bederman, International Law in Antiquity, Cambridge (2001); L. Henkin, R.C Pugh, O. Schachter and H. Smit, International Law, chapter 1, West Pub. Co., St Paul (1980) [Hereinafter cited as Henkin & Associates]; A. Nussbaum, A Concise History of the Law of Nations, rev. ed.. New York (1954); Malanczuk, chapter 2; Shaw, pp. 13-31; and Encyclopedia of Public International Law, vol. VII, Amsterdam (1984).
[6] See Shaw, pp. 13-8.
[7] Henkin & Associates, p. 1. Note that Fredrick III, German Emperor from 1440 to 1493 was the last of the emperors crowned in Rome by the Pope.
[8] See Shaw, p. 21.
[9] Id.
[10] Note that while the Roman Law, as codified in Justinian’s Corpus Juries spread its influence over almost the entire European continent, Cannon Law, with its essentially Romantic conceptual framework, had an important influence on many aspects of English Law.
[11] Henkin & Associate,. p. 2.
[12] Id. p. 3.
[13] See Shaw, p. 23.
[14] Id.
[15] See id. pp. 22-5; and Bledsoe and Boczek, pp. 20-5.
[16] See generally id. pp. 26-29.
[17] Henkin & associates, p. 7.
[18] See id, pp. 8-9.
[19] See id. p. 9.
[20] See infra chapter 4.