vatsaraṁ bhūpatiṁ cakrur
yavīyāṁsaṁ bhrameḥ sutam
It appears that although there was monarchy, it was not at all an autocracy. There were senior family members and ministers who could make changes and elect the proper person to the throne, although the throne could be occupied only by the royal family. In modern days also, wherever there is monarchy, sometimes the ministers and elderly members of the family select one member from the royal family to occupy the throne in preference to another.