Celtris III is a planet in the Cardassian Union. Elim Garak once visited the planet on a mission for the Obsidian Order. (DS9 novel: A Stitch in Time) In 2369, the Cardassians used metagenic weapons on the planet to lure Jean-Luc Picard to the planet, where Gul Madred tortured him in a plan to learn classified Starfleet secrets. (TNG episodes: "Chain of Command", "Chain of Command, Part II")