A Hersir was a local Viking military commander of approximately 100 men, who owed allegiance to a Jarl or a King.
Viking society was a chieftain or clan society. These Chieftains were landowners and similar to many feudal societies, supported the Kings in their centralization of power. A Chieftain society differs from a state in that it has no central government. Instead it is ruled by several, even many chieftains or lords, each of whom has his own domain of influence.