Starbase 499 was a Federation starbase. In 2294, this starbase was the closest Starfleet staging area to the Beta Promethean system. The USS Excelsior and two other starships rallied here in preparation for action against the Beta Prometheans. The Plush Princess docked there to gather last minute information and supplies to help liberate the nine hostages held by the Beta Prometheans. (TOS novel: The Fearful Summons)