[§ 7. Jural Bases
]
The nature of modern international law is in part due to the jural bases upon which it rests.
(a) The Roman law was the most potent influence in determining the early development, particularly in respect to dominion and acquisition of territory. International law gained a certain dignity and weight from its relation to the Roman law, the most potent legal institution in history.
(b) The canon law, as the law of the ecclesiastics who were supposed to recognize the broadest principles of human unity, gave an ethical element to early international law. Gregory IX. (1227-1241), the Justinian of the Church, reduced canon law to a code. The abstract reasoning upon its principles among the clergy and counsellors of kings, made it a part of the mental stock of the early text writers, while it strongly influenced state practice. The canon law gave a quasi-religious sanction to its observance, and in so far as international law embodied its principles, gave the same sanction to the observance of international equity. This may be seen in the religious formula in treaties, even to a late date.
(c) The common law, itself international as derived from three systems, according to tradition, by Edward the Confessor, and subsequently modified by custom, furnished a practical element in determining the nature of international law.
(d) Equity promoted the development of the recognition of principles in international law. In the early days of England cases arose which were not within the cognizance of the common law judges. The petitioner having applied to the king in Parliament or in council for justice, his petition was referred to the chancellor, the keeper of the king's conscience, who, after a hearing, required that what was equitable should be done. Thus the simpler matters came before the common law court, the more difficult before the equity court. Even now a jury largely deals with questions relating to the recovery of money, and their decision is a verdict, which is followed by a judgment. In an equity court, the more difficult problems of business and commerce are considered; and the decision of the judge is a decree.
(e) Admiralty law may be defined as in one sense the law of the sea. Anterior to and during the Middle Ages, the maritime relations of states gave rise to sea laws, many of which are to-day well-recognized principles of international law.
[§ 8. International and Statute Law
]
Statute law proceeds from legislative enactment, and is enforced by the power of the enacting state within its jurisdiction.
International law, on the other hand, is not formally enacted, and has no tribunal for its enforcement. Resort may be had to war in case of infraction of its rules, but the issue may rather depend upon the relative powers of the two states and not upon the justice of the cause.