Belongo was a nephew of Grand Nagus Zek. In 2371, he was being held by Starfleet on Aldebaron III. Quark contacted Captain Benjamin Sisko while Sisko was on his way to Earth to participate in a conference on the Dominion situation. Quark reminded Sisko that it was Zek who first brought Starfleet's attention to the Dominion. Sisko also owed Zek a favor. (DS9: "Past Tense, Part I")