The Feiran was one of the large city-starships of the Caeliar civilization, originally located on the planet Erigol halfway between the cities of Axion and Kintana.
In 2168, the Columbia MACOs revolted against their forced imprisonment on the planet, and sought to take over the Great Work apparatus at Mantilis to open a subspace tunnel back to Earth for the ship to pass through. As backup, the MACOs had planted explosives at Feiran, destroying it at a critical moment to further their cause. (ST - Destiny novel: Gods of Night)