| Sumario: | The dynamics between correlation and cooperation of several sources of Law configures the so called juridical medieval pluralism. The jurists formed at the Universities would take us to the realms the debates concerning the renovation of the studies of Ronlan Law to its private political realities contributing to the construction of a juridical culture substantiated by the Ius Commune. On this process, the valid private Law (Iura propria), would be an object of gradual hierarchization regarding to the principles of validity generally stated by the Royal Court generating pressure and resistance. However, the concept of a genuine landlord would be affirmed as priority entailing the monarchy to the natives of its land and kingdom. An analysis in the line of the History of Law, applied iii the mid thirteenth century, in the Portuguese kingdom, through the documentation collated in the Livro das Leis e Posturas in the Siete Partidas and in the historiographic - theorical and juridical outline related to the proposed subject.
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