A planet with ancient ruins of great interest to archaeologists, and the subject of the conference Picard hosted aboard the Enterprise.
Tagus III is famous among archaeologists for its ancient ruins, which have been closed to outside study for many years. The Federation Archaeology Council holds a symposium aboard the Enterprise at which Picard is due to deliver the keynote address about the planet.
In Qpid, the conference brings Vash back into Picard's life, and Picard learns that she plans to steal artifacts from the Tagus ruins. Q interrupts the event by sending the senior staff into a Robin Hood fantasy before letting them return to the gathering.