Western legal systems first recognized a core underpinning of conflict of laws—namely, that "foreign law, in appropriate instances, should be applied to foreign cases"—in the twelfth century. Prior to that, the prevailing system was that of
personal law, in which the laws applicable to each individual were dictated by the group to which he or she belonged. Later, in the seventeenth century, several Dutch legal scholars, including
Christian Rodenburg,
Paulus Voet,
Johannes Voet, and
Ulrik Huber, further expounded the jurisprudence of conflict of laws. The doctrine of
comity was introduced as one of the means to answer these questions. Many states continue to recognize the principle of comity as the underpinning of private international law such as in Canada. In some countries, such as the United States of America and Australia, the principle of comity is written into the State's constitution. In the United States, salient issues in the field of conflict of laws date back at least to the framing of the Constitution. There was concern, for example, about what body of law the newly created federal courts would apply when handling cases between parties from different states (a type of case
specifically assigned to the federal courts). Within the first two decades following ratification of the Constitution, over one hundred cases dealt with these issues, though the term
conflict of laws was not yet used. and as a result, American judges encounter conflicts cases far more often—about 5,000 per year as of the mid-2010s—and have accumulated far more experience in resolving them than anywhere else in the world. The first major multilateral agreements on the topic of conflict of laws arose from the
First South American Congress of Private International Law, which was held in
Montevideo from August 1888 to February 1889. This was followed by successive conferences in 1894, 1900, and 1904. As attention to the field became more widespread in the second half of the twentieth century, the
European Union began to take action to harmonize conflict of laws jurisprudence across its member states. The first of these was the
Brussels Convention agreed in 1968, which addressed questions of jurisdiction for cross-border cases. This was followed in 1980 by the
Rome Convention, which addressed choice-of-law rules for contract disputes within EU member states. In 2009 and 2010, respectively, the EU enacted the
Rome II Regulation to address choice-of-law in tort cases ==Jurisdiction==