This book uses the cases of Syrian factions in rebel-held areas, Hamas in the Gaza Strip, Houthi in Yemen, rebels in Libya, Taliban in Afghanistan, In Iraq, and Somalia to explain the importance of examining genealogies tribalism, common local knowledge and social networks in understanding the institutionalisation of armed group governance systems. The book provides a series of studies employing heterogenous methodological approaches to address the issue using qualitative, quantitative and mixed methods. The proposed project also attempts to move away from the central debate on the national political crisis trend by examining the sub-national level patterns and assessing various factors and questions that bring about clear answers regarding how de-facto rulers use tribes and tribal informal institutions to sustain their presence and create a safe social incubator.