This article is undergoing revision as part of Project: Planets, a collaborative effort to improve BattleTechWiki's coverage of planets and systems. If you would like to participate, please visit the project page, where you can add your name to the list of volunteers.

This article has completed Phase 2 of the Overhaul effort.

Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)

Tyrrhenia neighbouring systems
Tyrrhenia neighbouring systems
System information
X:Y Coordinates 428.56 : -488.47[e]

Political Affiliation[edit]

Planetary History[edit]

Post-Jihad Years[edit]

The war between the Taurian Concordat and Federated Suns officially ended on the 2nd of July 3080 in the aftermath of Operation MATADOR, but the fortunes of the Concordat continued to decline. Many worlds, lacking confidence in the Concordat's central government, seceded from the Concordat; Tyrrhenia was the first of the Concordat worlds to do so,[25] leaving the Concordat even before the Jihad had begun,[9][16] and a number of other worlds close to the border of the Calderon Protectorate had done the same by 3085. Where the Taurian government had fought a war a decade before with the breakaway Protectorate, Tyrrhenia and the other worlds that left the Concordat in the aftermath of the Jihad were effectively ignored in favour of reinforcing the narrow salient securing the Pleiades Cluster.[25]

The Dark Age[edit]

After the turn of the thirty-second century diplomatic efforts by the rulers of the Calderon Protectorate resulted in the construction of a new military production facility on Erod's Escape, with that construction being supervised by technical advisors from the Republic of the Sphere[26] and the Federated Suns. The Protectorate Military Industries (PMI) plant would go on to produce the lion's share of the Combat Vehicles that would serve the Protectorate's military forces, while also producing a large proportion of the Protectorate's BattleMechs.[27] A second, smaller PMI plant was constructed in a similarly supervised fashion on Tyrrhenia.[26][28]

Military Deployment[edit]


Industrial Centers[edit]

Nearby Systems[edit]

Systems within 60 light-years (distance in light years)
Closest systems first:
Franmalin 28.1 Fylovar 34.1 Colchis 39.3 Mirfak 52.6
Belle Isle 53.4


It was confirmed by one of the writers that the plant opened on Tyrrhenia in the thirty-second century was a PMI facility, and was still in operation in 3145:[28]

Yes, it was intended to be another PMI facility. It also should still be functioning.

Aaron "Gravedigger" Pollyea

  — Aaron "Gravedigger" Pollyea, BattleTech Writer, 10 Mar 2014


  1. 1.0 1.1 1.2 Handbook: Major Periphery States, p, 121, "Taurian Concordat after Age of War [2571], Fall of the Star League [2750] and End of the 3rd Succession War [3025]"
  2. Historical: Reunification War, p. 159, "Inner Sphere - [2596] Map"
  3. Era Report: 2750, p. 37, "Inner Sphere - [2750] Map"
  4. Field Manual: SLDF, "Inner Sphere - [2764] Map"
  5. Historical: Liberation of Terra Volume 1, p. 11, "Inner Sphere - [2765] Map"
  6. Field Report 2765: Periphery, p. 37, "Taurian Defense Forces Deployment Map - [2765] Map"
  7. Historical: Liberation of Terra Volume 2, p. 122-123, "Inner Sphere - [2822] Map"
  8. The Periphery (Sourcebook), p. 151, "Maps of the Periphery"
  9. 9.0 9.1 9.2 Handbook: Major Periphery States, p, 127, "Taurian Concordat after modern colonization drive [3040] and after FedCom Civil War [3067]"
  10. Historical: War of 3039, p. 133, "Inner Sphere - [3040] Map"
  11. Era Report: 3052, p. 11, "Inner Sphere - [3050] Map"
  12. Era Report: 3052, p. 23, "Inner Sphere - [3052] Map"
  13. Era Report: 3062, p. 11, Inner Sphere - [3057] Map
  14. The Periphery, 2nd Edition, p. 111, "Taurian Concordat and Tortuga Dominions"
  15. Era Report: 3062, p. 29, Inner Sphere - [3063] Map
  16. 16.0 16.1 Jihad: Final Reckoning, p. 43, "Inner Sphere - [3067] Map"
  17. Jihad Secrets: The Blake Documents, p. 63, "Inner Sphere - [3075] Map"
  18. Field Report: Periphery, p. 23, "Taurian Concordat Deployment Map - [August 3079]"
  19. Jihad: Final Reckoning, p. 63, "Inner Sphere - [3081] Map"
  20. Field Manual: 3085, p. Vii, "Inner Sphere - [3085] Map"
  21. Map of the Inner Sphere 3130
  22. Era Report: 3145, p. 11, "Inner Sphere - [3135] Map"
  23. Era Report: 3145, p. 39, "Inner Sphere - [3145] Map"
  24. Field Manual: 3145, p. VI, "Inner Sphere - [3145] Map"
  25. 25.0 25.1 Field Manual: 3085, p. 131, "Taurian Concordat"
  26. 26.0 26.1 Field Manual: 3145, p. 185, "Calderon Protectorate"
  27. 27.0 27.1 Field Manual: 3145, p. 188, "Calderon Protectorate"
  28. 28.0 28.1 Aaron "Gravedigger" Pollyea, BattleTech Writer, 10 Mar 2014
  29. Field Manual: 3145, p. 203, "Calderon Protectorate"