Conquiidor was a planet in the outer parts of Federation space in the mid-24th century, in the Alpha or the Beta Quadrant.
Circa 2358, the USS Seeker was on a mission to smash an Orion cartel operating on a number of outer Federation planets, including Conquiidor and Twenginian. On Conquiidor, Lieutenant Commander Darryl Adin led a rescue of over 200 Federation citizens from Orion slavery, marking him as a hero. (TNG novel: Survivors)