Yuuzhan Vong government

The Yuuzhan Vong government was a galactic power during the Sith Crusade. Hailing from the planet, the Yuuzhan Vong kept themselves to themselves and chose not to participate in galactic affairs.

In the year 65 ABY, it's Supreme Overlord was Cek Skell, who was killed by the Sith Hands Darth Korin and Darth Krayt.