Ancient Tamil Nadu contained three monarchical states , headed by kings called `` Vendhar '' and several tribal chieftaincies , headed by the chiefs called by the general denomination `` Vel '' or `` Velir '' .
Ancient Tamil Nadu contained three monarchical states , headed by kings called `` Ventar '' and several tribal chieftaincies , headed by the chiefs called by the general denomination `` Vel '' or `` Velir '' .