Legends of the Dreaming Sea
The Tribunal was instated by Ys, so that the sorcerer-princes would be free from the mundane duties of running Planquin.
There are 21 seats on the Tribunal, 10 are hereditary seats held by the noble families of Planquin the other 11 are elected by the people of the city. They are in charge of the civil bureaucracy, mandating changes with a simple majority vote. They are also totally corrupt, votes are bought and sold regularly.
According to Ys law any citizen may bring a motion to the Tribunal for a vote. Citizen is a category that includes slaves, but not thralls.
On the rare occasions when a sorcerer-prince bothers to attend, their vote outweighs that of the whole council.