The origins of modern Comparative Law can be traced back to Gottfried Wilhelm Leibniz in 1667 in his Latin-language book Nova Methodus Discendae Docendaeque Iurisprudentiae (New Methods of Studying and Teaching Jurisprudence).
[1] Chapter 7 (Presentation of Law as the Project for all Nations, Lands and Times) introduces the idea of classifying Legal Systems into several families.
His comparative approach is obvious in the following excerpt from Chapter III of Book I of his masterpiece, De l'esprit des lois (1748; first translated by Thomas Nugent, 1750):[3][T]he political and civil laws of each nation ... should be adapted in such a manner to the people for whom they are framed that it should be a great chance if those of one nation suit another.
They should be in relation to the nature and principle of each government: whether they form it, as may be said of politic laws; or whether they support it, as in the case of civil institutions.
They should be in relation to the climate of each country, to the quality of its soil, to its situation and extent, to the principal occupation of the natives, whether husbandmen, huntsmen, or shepherds: they should have relation to the degree of liberty which the constitution will bear; to the religion of the inhabitants, to their inclinations, riches, numbers, commerce, manners, and customs.Also, in Chapter XI (entitled 'How to compare two different Systems of Laws') of Book XXIX, discussing the French and English systems for punishment of false witnesses, he advises that "to determine which of those systems is most agreeable to reason, we must take them each as a whole and compare them in their entirety."
Yet another place where Montesquieu's comparative approach is evident is the following, from Chapter XIII of Book XXIX: As the civil laws depend on the political institutions, because they are made for the same society, whenever there is a design of adopting the civil law of another nation, it would be proper to examine beforehand whether they have both the same institutions and the same political law.The modern founding figure of comparative and anthropological jurisprudence was Sir Henry Maine, a British jurist and legal historian.
This disruption sparks an evolution where the external rule's meaning is redefined and where significant transformations within the internal context are triggered.
The characteristics that he believed uniquely differentiate the Western legal family from the other four are: Arminjon, Nolde, and Wolff[11] believed that, for purposes of classifying the (then) contemporary legal systems of the world, it was required that those systems per se get studied, irrespective of external factors, such as geographical ones.
They maintain that, to determine such families, five criteria should be taken into account, in particular: the historical background, the characteristic way of thought, the different institutions, the recognized sources of law, and the dominant ideology.