This research aims to elucidate the security foundations and values of solidarity established by the “Constitution of Medina”, acting as the first civil constitution seeking to orga nise the relationship between the multi-ethnic and multi-re ligious components of Yathrib society. The research problem stems from a central question on how this Document was able to dismantle the structure of deeply rooted social vio lence and transform it into sustainable societal security, con stituting a fundamental entry point for building a civilised human being and achieving the objective of Urbanisation. To investigate this, the study adopted the inductive method to track the texts of the Document, and the descriptive-an alytical method to link security aspects with contexts of de velopment and stability. Consequently, the research plan is crystallised into three main axes: The first addresses the conceptual framework of security and coexistence and their relationship to Urbanisation; the second does the political and social engineering involved in the transition from “tribal partisanship” to “state security”; whilst the third focused on mechanisms of economic mutual responsibility and the juris prudence of coexistence with the “Other” as guarantees for urban stability.