Parishath / Parishad - Court as defined in Parasara smruti

Parishath (Learned council) as given in Parasara smruthi translated to Tamil by Desikachariyar.

This could be understood like a court that gives punishments/prayaschittams for various sins.

 Three or four brahmins with veda knowledge doing angnihotram can form a parishath (council). This council can be approached for any doubts. 

Brahmin who have knowledge of vedas and vedangas but not agnihotris, such brahmins three or five in number can for parishath.

Group containing not less than 10, including people with 4 veda knowledge, people with knwoledge of process of parishath, people with knowledge of vedangams including jyothishyam, people with knowledge of dharma shastras can form parishadh.

Such a council could seek king's approval and give prayaschittams. 

once the parishath gives prayaschittham, if king tries doing beyond it, the sin will go to the king.