Antede III was the inhabited third planet of its star system. This planet was the homeworld for the Antedeans, a warp-capable species. It was located within three days travel of the planet Pacifica, and some of the inhabitants had antagonistic feelings for the Federation.
In 2365, the USS Enterprise-D was assigned to carry two delegates from Antede III to a conference on Pacifica, where their species would be offered Federation membership. The delegates turned out to be assassins. (TNG: "Manhunt")