This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
Regulus (Alpha Leonis) was the primary of the Alpha Leonis system, in the Beta Quadrant. This star was located three hundred light years from the Bajoran system. (DS9: "Fascination"; DIS: "Magic to Make the Sanest Man Go Mad")
In 2154, a Vulcan High Command attack fleet massed in this star's system in preparation for an abortive preemptive strike against the Andorians. Regulus was the closest accessible star known to be outside the maximum range of Andorian Imperial Guard listening posts. (ENT: "Kir'Shara")
In 2293, the location of Regulus in the Milky Way Galaxy was labeled in a star chart that was in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country, okudagram)
|Alpha Leonis system|
|Regulus • Regulus III • Regulus V|