A Federation colony whose destruction in 2368 was blamed on Bajoran militants, setting in motion the mission that brought Ro Laren aboard the Enterprise-D.
Solarion IV was a Federation settlement close to the Cardassian border. Its destruction opens the Next Generation episode Ensign Ro (2368).
A message claiming to be from Bajoran fighters takes responsibility for the attack. Admiral Kennelly sends Picard to find the militant leader Orta and assigns him Ensign Ro Laren, a Bajoran released from a Starfleet stockade for the purpose. Kennelly has secretly ordered her to offer Orta weapons.
Orta tells Picard his people lack ships capable of reaching Solarion IV at all. Picard and Ro expose the truth by escorting a Bajoran vessel with nobody aboard. The Cardassians destroy it, which shows that they staged the raid to draw the Federation into hunting Bajorans for them.