The political units during the Rigvedic or the early Vedic period comprised of Grama (village), Vish and Jana. The biggest political unit was that of Jana, after which came Vish and then, Grama.
The leader of a Grama was called Gramani, of a Vish was called Vishpati and that of Jana was known as Jyeshta. The rashtra (state) was governed by a Rajan (King) and he was known as Gopa (protector) and Samrat (supreme ruler).
The king ruled with the consent and approval of the people. There were four councils, namely Sabha, Samiti, Vidhata and Gana, of which women were allowed to attend only two, Sabha and Vidhata.
The duty of the king was to protect the tribe, in which he was assisted by the Purohita (chaplain) and the Senani (army chief).
The.legends.peperonity.com