The Tau Ceti Accords was a peace treaty signed between the Confederacy of Vulcan and the Andorian Empire before 2151. One of the provisions of the treaty was that the Andorians were not to have any presence on Coridan III.
Commander Shran of the Andorian Imperial Guard violated the Accords in 2151. (ENT episode: "Shadows of P'Jem")
External link[]
- Tau Ceti Accords article at Memory Alpha, the wiki for canon Star Trek.