Some further refinements of the Spartan constitution came after Lycurgus.
It turned out that sometimes the public speakers would pervert the sense of propositions and thus cause the people to vote foolishly, so the Gerousia reserved the right to dissolve the assembly if they saw this happening.

A hundred and thirty years after the death of Lycurgus, a council of five ephors took executive power from the kings.
When King Theopompus, in whose reign the ephors were established, was scolded by his wife for leaving his son less royal power than he had inherited, he replied: "No, it is greater, because it will last longer."
With their decision-making power reduced, the Spartan kings were freed of the jealousy of the people.
They never went through what happened in nearby Messene and Argos, where the kings held on so tight to every last bit of power that in the end they would end up losing it all.
Some further refinements of the Spartan constitution came after Lycurgus. It turned out that sometimes the public speakers would pervert the sense of propositions and thus cause the people to vote foolishly, so the Gerousia reserved the right to dissolve the assembly if they saw this happening.
A hundred and thirty years after the death of Lycurgus, a council of five ephors took executive power from the kings. When King Theopompus, in whose reign the ephors were established, was scolded by his wife for leaving his son less royal power than he had inherited, he replied: "No, it is greater, because it will last longer." With their decision-making power reduced, the Spartan kings were freed of the jealousy of the people. They never went through what happened in nearby Messene and Argos, where the kings held on so tight to every last bit of power that in the end they would end up losing it all.
Lycurgus of Sparta