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Ilyra VI was the inhabited sixth planet of its star system. According to Harry Mudd, this was a "charming planet" that had an "innocent and friendly populace."

At some point prior to stardate 4978, Harry Mudd escaped the robot planet he was imprisoned on by stealing a starship, and found refuge on this planet. While on Ilyra VI, Mudd committed fraud by selling Starfleet Space Academy to its inhabitants. His sale earned him enough credits to get him to Sirius IX. (TAS: "Mudd's Passion")

According to Harry Mudd in the novelization of "Mudd's Passion" (as published in Star Trek Log 3), Ilyra VI was granted full Federation status not long before his visit there.

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