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IV Legio

IV Legio.jpg
IV Legio Comitatensis
Unit Profile (as of 3067)
Nickname Imperial Legionnaires
Parent Formation Marian Legions
Formed 3058


IV Legio was formed to act as a rapid-response force for the Marian Legions. The IV Legio contained more vehicles than any other BattleMech Legion. The Legion deployed two vehicles for every 'Mech. The 'Mechs were typically faster medium and heavy models. The need to coordinate these fast vehicles and and 'Mechs made the IV Legio one of the most coordinated of the Marian Legions.

Deployed to Trasjkis, the Legion drove the Left Arm of Thor from the world, nearly eliminating half that battalion. Later they deployed to Trondheimal and encountered two battalions of light armor. These units inflicted heavy losses on the Legion before they were destroyed.[1]

During the Hegemony's invasion of the Circinus Federation the defenders were disguised as members of IV Legio.[2] The IV Legion actually spent most of the time of the Federation invasion pacifying worlds in the Illyrian district and fighting pirates.[3] The Legion was used to garrison Illyria, Trondheimal, and Reykavis.[4]

In 3074 IV Legio were on Trasjkis attempting to put down local resistance forces when they were themselves the target of a heavy raid performed by Blakist-baked mercenaries.[5][6] The Blakists had hired Grandin's Crusaders for the raid, and the Crusaders attacked on the 20th of March. The Crusaders dropped outside the planetary capital city - which the Marian Hegemony had renamed Nova Mediolanum - and made contact first with the various detachments IV Legio had set up in an effort to deter the local resistance. Unprepared for the sudden and unexpected arrival of an attacking force, the IV Legio detachments fell back to their temporary headquarters and called on reinforcements from elements of the Legion that had been detached on occupation duties. Those reinforcements attempted to assist, but were ambushed by battle armor squads from the Crusaders, who exploited the lack of experience the IV Legio MechWarriors had at fighting battle armor infantry, leaving the Marian forces flailing around while the bulk of the Crusaders 'Mechs struck at the Legion's headquarters. The Crusaders tore through a number of occupied buildings in an effort to achieve a level of surprise before attacking and destroying the IV Legio command center. A small number of security personnel attempted to attack the Crusaders, but were gunned down mercilessly by the mercenaries before the Crusaders went on to annihilate the Marian forces in the area. The Crusders then attacked the remaining IV Legio detachments with his 'Mechs, armour and infantry. When the Marians fell back to regroup Pierre Grandin disengaged his forces as his objective was complete, and the Crusaders lifted off from Trasjkis aboard the DropShip Tonnant even as a number of DropShips from the Circinus Federation arrived in orbit.[6]

IV Legio was used to pacify the Landfall system in 3079[7]. They had an important role keeping the retreat corridor open for other Legions to return to the Hegemony after raiding former Free Worlds League systems. They later returned to their previous garrison assignments by 3085. During the Bloody Tricentennial members of the Legion found several Blakist terrorists trying to poison Trondheimal's water supply. Thanks to the Legion's efforts, the terrorists were quickly killed and a massacre was avoided.[8]

In the Dark Age the Fourth Legion was stationed on Pompey, Ballalaba, and Horatius. These are heavily populated worlds and home to Hegemony industries. Being so heavily defended, the Fourth rarely saw action while garrisoning these worlds. They were responsible for driving a Duchy of Tamarind-Abbey raiding force that hit Pompey in 3142.[9] Since then they have remained on those same worlds.[10]


Rank Name Command
Commanding Officers of the IV Legio
Principes Julie Gupton 3064[1]
Prefect Chakra Sunkehl 3067[11]
Prefect Albert DeVereaux 3085[12]
Prefect Ferdinand Hurley 3145[10]


The IV Legio prefers to utilize hit-and-run maneuvers in striking logistical and weak points in order to bring down the enemy.[1] After their experience with putting down insurgents, they also became proficient in counter-insurgency operations.[3]

Composition HistoryEdit


IV Legio (Veteran/Reliable)[13]

Prima Cohors (1 Cohort/Veteran/Reliable)[1]
- The IV Legio Prima field the fewest upgraded 'Mechs in the Marian Legions.
Secunda Cohors (1 Reinforced Cohort/Regular/Reliable)[1]
  • CO: Legatus Lionel Mandrake
- The Secunda fields a both of fast hovercrafts, like the Saladin and Saracen.
Tertia Cohors (1 Maniple/Veteran/Reliable)[1]
  • CO: Legatus Michael Hutchisson
- The bulk of older assault 'Mech designs, are used by the Tertia.
Auxilia Comitatensie (1 Legion/Veteran/Reliable)[1]
  • CO: Prefect Jon "Bates" Battaglia


IV Legio (Regular/Reliable)[11]

  • CO: Prefect Chakra Sunkehl
Prima Cohors (1 Cohort/Veteran/Reliable)[11]
  • CO: Legatus Onufry Sopczak
Secunda Cohors (1 Cohort/Regular/Questionable)[11]
  • CO: Legatus Terryl Mulberry
Tertia Cohors (1 Cohort/Veteran/Reliable)[11]
  • CO: Legatus Gorman Tuman
IV Auxilia Legio (1 Legion/Regular/Reliable)[11]
  • CO: Prefect Harry Ontkean


IV Legio (Regular/Reliable)[12]

  • CO: Prefect Albert DeVereaux
Prima Cohors (Veteran/Reliable)[12]
  • CO: Prefect Severine Xavier
Secunda Cohors (Regular/Reliable)[12]
  • CO: Prefect Hulda Adessi
Tertia Cohors (Green/Questionable)[12]
  • CO: Prefect Alberich Winograd
IV Auxilia Legio (Regular/Reliable)[12]
  • CO: Legatus Chandra Roscoe


IV Legio (Regular/Reliable)[10]

  • CO: Prefect Ferdinand Hurley
Prima Cohors (Regular/Reliable)[10]
  • CO: Prefect Emerson Souza
Secunda Cohors (Veteran/Reliable)[10]
  • CO: Legatus Humberto Neumann
Tertia Cohors (Regular/Questionable)[10]
  • CO: Prefect Coy Patten
Quarta Cohors (Regular/Reliable)[10]
  • CO: Prefect Erich Lear
Quinta Cohors (Veteran/Fanatical)[10]
  • CO: Prefect Renaldo Dempsey
IV Prima Auxilia Legio (Regular/Reliable)
  • CO: Legatus Porter Starks
IV Secunda Auxilia Legio (Green/Reliable)
  • CO: Prefect Antone Tilley
IV Caelum Wing (Veteran/Reliable)
  • CO: Prefect Sal Neel




  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Field Manual: Periphery, p. 80, "IV Legio Unit Profile"
  2. Field Manual: Updates, p. 194
  3. 3.0 3.1 Field Manual: Updates, p. 195
  4. Field Manual: Updates, p. 202
  5. Jihad Hot Spots: 3076, p. 40-41, "Chaos Overwhelming: Roman Candle"
  6. 6.0 6.1 Total Chaos, p. 133-134, "Roman Candle"
  7. Field Report: Periphery, p. 15
  8. Field Manual: 3085, p. 143
  9. Field Manual: 3145, p. 196
  10. 10.0 10.1 10.2 10.3 10.4 10.5 10.6 10.7 Field Manual: 3145, p. 202, "Marian Hegemony Armed Forces"
  11. 11.0 11.1 11.2 11.3 11.4 11.5 Field Manual: Updates, p. 202, "Marian Hegemony Armed Forces Deployment Table - 3067"
  12. 12.0 12.1 12.2 12.3 12.4 12.5 Field Manual: 3085, p. 151, "Marian Hegemony Deployment Table - 3085"
  13. Field Manual: Periphery, p. 143