The Four Sages of Dwartii were controversial philosophers and lawgivers from the early days of the Galactic Republic. The Four Sages were Sistros, Faya, Yanjon, and Braata.
The figure of Sistros appears on the Speaker's staff, which is included in the Mas Amedda action figure. The figure in the staff is not clearly visible in the film, however.
The statues of Faya and Yanjon can be seen at the entrance to Palpatine's private office when he reveals himself to be a Sith Lord to Anakin. They are on each side of the entrance. Sistros and Braata occupy the main office area.