New Antioch, Shakuras, was the main protoss settlement on that world after the fall of Aiur. It became the site of the Executor's Citadel. The protoss held war councils with Raszagal there.
New Antioch appears as a twilight wasteland map in StarCraft II. Destructible rocks block a rear-door passage into the starting bases, and there are other passages blocked only by LoS blockers.