It seems that, as the ruler of the ancient capital, Zaban held a certain superiority of rank over his fellow duces and may have acted as their commander-in-chief.
[1] In 574, Zaban invaded the lands of Guntram, King of Burgundy, in what is today Switzerland, but was repulsed and had to return to Italy.
Rodanus besieged Grenoble and Zaban passing down the valley of the Durance by Die, laid siege to Valence.
Amo successfully subdued the regions of Arles and Marseilles, while Mummolus rescued the city of Grenoble and sent Rodanus and his army of 500 to the protection of Zaban's forces.
Mummolus invaded Italy and forced Zaban and Rodanus to return to their own duchies, while Amo had to abandon his booty while crossing the Alps.