The African Union (AU) norm relating to unconstitutional changes of government (UCG) distinguishes the African peace and security order from other regional and global peace and security orders. This norm assigns the regional organization an intrusive role unparalleled by other international organizations as far as the constitutional and democratic order of member states is concerned. The norm bans UCG and also provides for enforcement measures that received regional constitutional status in the founding treaty establishing the AU. Despite its emergence accompanying the democratization process that countries on the continent ventured into in the 1990s, seen in the light of Africa’s unhappy experience with illegal change or seizure of government, this norm cannot be dissociated from the continent’s concern about peace and security.