Discovered 1930 by Clyde Tombaugh. Considered a planet between 1930 and 2006. Controversially reclassified as a planetoid in 2006. Re-re-classified as a dwarf planet in 2008, pleasing neither side of the debate. Peter David solved it by having Pluto eaten by the Borg in a recent novel, so there!

Pluto is of course governed by a plutocracy.