The Ullian homeworld was the home planet of the Ullians.

The USS Enterprise-D visited this inhabited planet in 2368 to return a Ullian delegation of telepathic historians after discovering Jev, part of the delegation, had committed acts of telepathic memory invasion against Enterprise crewmembers and citizens of worlds visited by the Ullians. Physicians from the homeworld contacted the Enterprise in order to assist the affected crew with their recovery. (TNG: "Violations")

This planet was only mentioned in dialogue.
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