This three-part report by the Sana’a Center examines the multi-faceted relationship between tribes and the state in Yemen. It shows that this relationship has long been a complex one, with the relative power of each waxing and waning. However recently – starting before the current conflict began – a protracted period of co-option of tribal leaders into the state apparatus has led to both a strengthening of the wealth and influence of some individual sheikhs, and to a weakening of…