 The Hunnic rulers had thus an empire at their disposal with the resources of subject people who were required to supply additional forces for their ongoing raids and conquests.The most memorable of their rulers became Attila, who eventually challenged the Roman Empire for supremacy.After the death of Attila, one of his subject rulers, Ardaric, waged a successful civil war against the heirs of Attila, helping several tribes to break apart and regain their independence.