Marines Errant
GW canon
Summary
Fleet-based 23rd Founding Chapter from the Eagle Warriors that has crusaded far beyond Imperial space and returned.
Lineage Note (sources, uncertainties)
Founding Chapter per the Lexicanum: the Eagle Warriors (themselves an Ultramarines successor). The Marines Errant are therefore a second-tier successor.
Allegiance
Loyalists
Founding
23rd Founding
Homeworld
No homeworld (fleet-based); fortress-monastery Vilamus
Colours
Halved blue and white, golden aquila, company marker on the left kneepad
Doctrine
Fleet-based crusading
Epoch
M37–M41
Chapter Strength
More than 120
History
The Chapter was formed in the 23rd Founding from the Eagle Warriors and cruises the fringes of the galaxy as a fleet-based force, often far beyond Imperial borders. On the Kadyrov Voyage into the Hazeroth Abyss only its Battle Barge survived. In the Badab War Chapter Master Corwin Admatha fell in a Mantis Warriors trap; in late M41 Huron Blackheart stole nearly all its gene-seed at Vilamus.
Notes
Fleet-adapted Codex: captains command cruisers autonomously, task forces recruit aspirants en route. Many Apothecaries guard the gene-seed, Terminator armour is strictly rationed. In 390.M38 the Chapter sealed the Covenant of Ecale with a Rogue Trader house.
Additional Information
Founding, detail
M37
Sources
Lexicanum, article “Marines Errant” (revision 798982, retrieved 25 Oct 2026): https://wh40k.lexicanum.com/wiki/Marines_Errant. Works cited there: White Dwarf 101 (UK); Warhammer 40,000 5th Edition Rulebook; Imperial Armour Volume Nine - The Badab War - Part One; Deathwatch: The Jericho Reach.