A star system near the Romulan Neutral Zone where the lost USS Pegasus was found fused inside an asteroid in 2370, exposing an illegal Federation cloaking experiment.
The Devolin system is an asteroid-filled star system close to the Neutral Zone. It is the setting of the seventh-season Next Generation episode The Pegasus.
Twelve years after the USS Pegasus was reported destroyed, Starfleet Intelligence learns that the Romulans have located debris from it. Admiral Erik Pressman, its former captain, joins the Enterprise-D in 2370 to recover the ship first, with Riker, who served under him as an ensign, bound to secrecy. A Romulan warbird, the Terix, is already searching the system.
The Pegasus is detected deep inside a large asteroid, into which it drifted while its experimental phasing cloak was running. Picard takes the Enterprise in through a fissure, and the Romulans seal the entrance behind it. To escape, the crew fit the prototype and fly out through solid rock, after which Picard reveals the treaty violation and has Pressman arrested.