The Cyrene system was home to at least one habitable world.
The Cyrene system was colonized at some point after the late twenty-sixth century by the Alexandrian Covenant, a Deep Periphery proto-state created through the merger of colonists from the Magistracy of Canopus and the Taurian Concordat. At its height the Alexandrian Covenant was a nation of multiple worlds that enjoyed a degree of interplanetary trade; however, beginning in the 2700s, the Alexandrian Covenant was engulfed in a series of destructive civil wars known as Upheavals that eventually led to the loss of interstellar travel within the Covenant. The location of Cyrene was identified by Interstellar Expeditions at some point after 3093, but at that point the Cyrene system was uninhabited; IE found evidence of past habitation on the planet and of an extinction-scale level of destruction, but were unable to date the destruction to a period corresponding to any of the known Upheavals, leaving the mystery of what wiped out the population of Cyrene unsolved.
The Alexandrian Covenant is detailed within Interstellar Players 3: Interstellar Expeditions, but no map of the state is given - only the location of the Covenant in the Deep Periphery. It is therefore impossible to determine the precise location of Cyrene.
- Interstellar Players 3: Interstellar Expeditions, p. 87, "Lost Worlds"
- Interstellar Players 3: Interstellar Expeditions, p. 76, "Deep Periphery (Rimward Sector)"
- Interstellar Players 3: Interstellar Expeditions, p. 84-85, "To The Lighthouse"
- Interstellar Players 3: Interstellar Expeditions, p. 85, "Day and Night"