The polity of the Rig Vedic period was that of a tribal society. The chief of the tribe was the main political head and he was called rajan.  

• The purohita or priest offered advice to the king. Vedic priests advised the kings, inspired them and praised their deeds. In turn they received rewards for their services.  
• Senani was the chief of army.  

• There is no evidence of tax collecting officers. Perhaps people made voluntary contribution called bali to the king. Some scholars say that bali was an imposed tax, and not voluntary.  
• There is no reference to the administration of justice.  

Source: Tamil Nadu state board.