Sio Bibble was the governor of Naboo and head of the planet's Royal Advisory Council.
Crisis on Naboo
Bibble was elected years before the Invasion of Naboo and continued to serve during and after the reign of Queen Amidala. In 20 BBY, Sio greeted Palpatine to Naboo and was present at the Festival of Lights when Count Dooku attempted to abduct Chancellor Palpatine with the help of Bounty Hunters Cad Bane, Moralo Eval, Rako Hardeen, Twazzi, Embo and Derrown. They were thwarted by Obi Wan Kenobi, who was disguised as Rako Hardeen.
The Disappeared, Part I
In 19 BBY, Bibble went with Amidala to the Galactic Senate of the Galactic Republic. During the meeting, Queen Julia of Bardotta contacted the Senate. Palpatine was about to say the people he had chosen to go to Bardotta: Senator Bail Organa of Alderaan and Senator Amidala of the Naboo. However, Julia specifically requested Junior Representative Jar Jar Binks of Naboo, puzzling everyone.