The invention of the Senate

[timelets]

Among the many innovations which Lycurgus made, the first and most important was his institution of a senate, or Council of Elders, which, as Plato says, by being blended with the "feverish" government of the kings, and by having an equal vote with them in matters of the highest importance, brought safety and due moderation into counsels of state. For before this the civil polity was veering and unsteady, inclining at one time to follow the kings towards tyranny, and at another to follow the multitude towards democracy; but now, by making the power of the senate a sort of ballast for the ship of state and putting her on a steady keel, it achieved the safest and the most orderly arrangement, since the twenty-eight senators always took the side of the kings when it was a question of curbing democracy, and, on the other hand, always strengthened the people to withstand the encroachments of tyranny.

https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Lives/Lycurgus*.html

cf the comparison to the ship, wrt keeping a steady course.