Persephone
Persephone V was the inhabited fifth planet of its star system.
In 2364, Admiral Mark Jameson lived in semi-retirement on Persephone V prior to being called into service to help with hostage negotiations on Mordan IV. (TNG: "Too Short a Season")
According to the Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Persephone V was a Federation member.