The Ruling Power was the government in charge of the planet of Euceron. Headquartered in the planet's capital city, Eusebus, the Ruling Power hosted the Galactic Games of 26 BBY.
Euceron had one of the largest security forces in the galaxy for a world of its size. The Ruling Power, however, ruled by repression and intimidation; its ten rulers made the laws and decisions for the entire planet. An individual ruler's title was numerical: "Ruler One," "Ruler Two," etc.
The Galactic Senate did not normally support this kind of government, but the safety and peace of the people during the Galactic Games was critical, and was the reason why the Jedi High Council, at the Ruling Power's request, sent three teams of Jedi to help monitor the events and keep the peace there.
When a conspiracy initiated by high-profile members of the Galactic Games Council against certain Galactic Senators was finally exposed, the criminal hearing was presided over by Rulers Three, Six, and Seven.
- The Complete Star Wars Encyclopedia