The Interplanetary Governing Body
The Interplanetary Governing Body (IPGB) is a group of representatives that govern the solar system. They create the laws, can place sanctions on planets and can prevent wars from happening. They run the solar system and overview all trade that takes place.
The IPGB is based on Gia. This gives the governors easy assess to the library vaults, and it's a nice central point in the solar system, protected by the Gian Peace Treaty.