The Legio Praetor is a Loyalist Titan Legion of the Collegia Titanica, one of the military arms of the Adeptus Mechanicus. There is very little information in Imperial records about this obscure Titan Legion, and it is unknown when it was founded and from what Forge World it hails.
- Battle of Macragge (754.M41) - The Legio Praetor is known to have taken part in the Battle of Macragge where it aided the Ultramarines Space Marines Chapter in the defence of their homeworld of Macragge from the predations of the Tyranid Hive Fleet Behemoth.
- Semper Sanctus - Warlord-class Titan and war engine of Princeps Sidarius Calvin during the Battle of Macragge.
- Sidarius Calvin - Princeps of the Warlord-class Titan Semper Sanctus during the Battle of Macragge. Calvin was supporting the forces defending the Northern Polar Defence Grid, and engaged with a Tyranid construct which would later become known as a Hierophant Bio-Titan. Smaller Tyranid bioforms attempted to scale the Imperial war machine, and although they were targetted by ground-level troops, the sheer amount of bodies and corpses soon clogged the Titan's joints, immobilising it. With his war engine severely damaged and unable to move, Calvin decided to manually overload the Titan's plasma reactor. The resulting explosion obliterated the Hierophant and all other surrounding Tyranids.
The colours of the Legio Praetor are not listed in current Imperial records.
The Legion badge of the Legio Praetor is not listed in current Imperial records.
- White Dwarf 256 (UK), "Codicium Imperialis: Defenders of Ultramar - Volume IX, part I of the Liber Victorum: the Battle of Macragge," by Graham McNeill, pg. 67