Tigon IV was a Federation colony in the 24th century located in the Beta Quadrant. (Star Trek: Pioneer) The planet was the home of the eccentric human historian Felix Adar for a time, where he worked off and on at the University of Tigon IV. ("Gateway") In 2381, the planet was destroyed by the so'jan fleet shortly after their Revenge-class warships were launched. Later Starfleet would speculate that the Coalition had used a Mass Driver on the planet to test the weapon-vessel's abilities. ("Prime Target")