Around 1 BBY, a small rebellious militia group from planets within the Mirial system was active before its members were imprisoned by the Galactic Empire across different prisons in an attempt to separate them. The Empire's efforts, however, were not enough as the Mirialan Yalla, a member of the militia who had been imprisoned in Imperial Detention Center & Labor Camp LEG-817 on the planet Wobani, knew other prisoners at Wobani that were part of the group and made contact with them, sharing brief coded exchanges. Sometime afterward, the group unsuccessfully attempted to escape the prison and Yalla was killed.
The Mirial system was introduced in the new Star Wars canon on a galactic map included with the Star Wars: The Force Awakens Beginner Game, a roleplaying game produced by Fantasy Flight Games and released in 2016. The system was later identified in the 2017 young-adult novel Rebel Rising, written by Beth Revis. In the Star Wars Legends continuity, the Mirial system was first indirectly mentioned in the 2001 novel Cloak of Deception, written by James Luceno, before it was later identified in the 2009 reference book The Essential Atlas, written by Daniel Wallace and Jason Fry.
- Star Wars: The Force Awakens Beginner Game
- Star Wars: Galaxy's Edge: Traveler's Guide to Batuu