Ligillium was a location with ruins reputed to hold the fabled Zaterl emerald.

In 2367, Captain Jean-Luc Picard offered to take con artist "Ardra" to Ligillium if she accepted arbitration on the Contract of Ardra. She declined his offer, saying she had "enough jewels". (TNG: "Devil's Due")

This location was only mentioned in dialogue.
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