The world of Naboo possessed a governing constitution, which stipulated that the planet's monarch could only serve a maximum of two terms. There was a near amendment to this rule in 28 BBY, intended to permit Queen Padmé Amidala to remain in power beyond the normal limit following the Invasion of Naboo. However, she declined this extension, despite confessing to her handmaiden, Sabé, that she had considered accepting.
During 22 BBY, Amidala spoke with Jedi Padawan, Anakin Skywalker, about this situation, expressing her relief at the conclusion of her two terms. The planet was governed by this constitution.