The Cluster contained about 12,000 stars, orbited by almost 600 habitable planets. Of these 600, 464 were part of the Cronese Mandate. The other 136 were divided between the Tion Hegemony and the Allied Tion.
The Cluster was at the edge of one of the galaxy's spiral arms. Just Coreward of the Cluster was the Cron Drift and the former Jedi stronghold of Ossus. The Perlemian Trade Route passed close to the cluster at Lianna.
The Tion Cluster had inhabited Human settlements pre-dating both the Old Republic as well as several planets in the Core Worlds. The Humans were descended from a lost sleeper ship from Coruscant. They developed a mixed society with Rakata castoffs, and utilized some of their technology to create beam tubes circa 27,000 BBY, and eventually limited hyperdrives that relied upon fixed-position hyperspace beacons. Rakata Force-sensitive technology was also present in Xim's war-robots.
The limited technology prevented the Tionese from having contact with the Core, who eventually forgot their origins and remained isolated from the rest of the galaxy. The Tionese, however, soon fell upon Hutt Space, resulting in a disastrous war that shattered the region.
In the Republic's final years, the Cluster's disparate states eventually joined up to form two dominions: the Tion Hegemony and the Kingdom of Cron. Both joined the Confederacy of Independent Systems during the Clone Wars. Count Dooku used a communications center on Raxus Prime to broadcast Separatist propaganda prior to the conflict. During the Wars, Dooku built up a secret base on the world and hunted the Force Harvester superweapon on the planet. The Separatist Parliament, meanwhile, performed its duties on Raxus Secundus, a heavily fortified world in the same system.
In retaliation for the Cluster's Separatist allegiance, the Galactic Empire divided the area into three sectors after the war, forming the Allied Tion Sector, the Tion Hegemony, and the Cronese Mandate. Due to the strategic location of the Cluster's sectors, the Imperial Military increased its presence inside the cluster  and attempted to use the nearby Calamari sector as a forward base to rapidly launch strikes at the Cluster from outside.
During the Galactic Civil War, several star systems inside the Tion Cluster became battlegrounds between the Empire and the Alliance to Restore the Republic, during Operation Strike Fear. Later, some of the Heroes of Yavin encountered the notorious bounty hunter Boba Fett on Panna Prime, as part of a trap devised by Darth Vader to track down the Rebel leadership. After the Battle of Endor, the entire Cluster was integrated in Zsinj's Empire. The three sectors stayed under Zsinj control until his death in 8 ABY, becoming independant again.
- Star Wars: The Old Republic (Codex entry)
- Star Wars: Darth Plagueis (Mentioned only)
- Tempest Feud (Mentioned only)
- Star Wars: The Clone Wars video game
- Jedi: Mace Windu
- Jedi: Shaak Ti (Mentioned only)
- Star Wars: The Clone Wars – "Heroes on Both Sides"
- Dark Lord: The Rise of Darth Vader
- Han Solo and the Lost Legacy
- The Story of the Faithful Wookiee (First appearance)
- Mission to Lianna
- Millennium Falcon
- Geonosis and the Outer Rim Worlds
- The New Essential Chronology
- Ultimate Adversaries
- The Force Unleashed Campaign Guide
- The New Essential Guide to Droids
- The Essential Atlas
- "Blaster"—Star Wars Insider 111
- Star Wars: The Official Starships & Vehicles Collection 31
- The Written Word
- The Unknown Regions
- The Essential Guide to Warfare
- Star Wars: The Clone Wars: Episode Guide
- Star Wars: Edge of the Empire Core Rulebook
Notes and referencesEdit
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 The Essential Atlas
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.37 2.38 2.39 2.40 2.41 2.42
- ↑ The Essential Guide to Warfare
- ↑ 4.0 4.1 Mission to Lianna
- ↑ The New Essential Chronology
- ↑ HoloNet News Vol. 531 54 (content now unavailable; backup links 1 2 on Archive.org) —
- ↑ Star Wars: The Clone Wars: Episode Guide
- ↑ 10.0 10.1 The Story of the Faithful Wookiee
- ↑ Mission to Lianna
- ↑ Geonosis and the Outer Rim Worlds
- ↑ Star Wars: X-wing