This archive tracks four layers. A record present in 1 of them (M41) is silent in the rest, and says so.
The Horus HeresyM30–M31
[RECORD LOST]
No record for this location in The Horus Heresy.
Position in this era: [RECORD LOST].
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
Position in this era: [RECORD LOST].
The 41st Millenniumpre-Rift
imperium
Ultramarines Battle Barge
A Battle Barge of the Ultramarines, still in service ten thousand years after the Horus Heresy. Marneus Calgar travels aboard her to Ichar IV in 993.M41, and later she carries the Ultramarines force bound for the Ork-invaded Vortengard Spiral, aboard which the Chapter's commanders hold council over the Tyranid attack on Styxia Prime (Catechism of Hate).
Position: Ichar System (Ichar IV) Ultramarines Battle Barge that carried Marneus Calgar to Ichar IV in 993.M41. In Catechism of Hate the Chapter's commanders hold council aboard her while the armada is bound for the Vortengard Spiral, a region no page places, so she is docked at Ichar, the last system the sources put her in
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position in this era: [RECORD LOST].
Position
A mobile record: it carries a position timeline rather than a fixed point. The archive places it in 1 of the four eras (M41); each era section above carries that era's entry.
Books set here
1 title in the reading tracker touches this record. Titles link out to the tracker.
Every fact in this record, and where it came from. Editorial derivations say so.
identityhigh
wh40k.lexicanum.com/wiki/Octavius (read directly in a browser with fetch-page.mjs, 2026-10-05): 'The Octavius is a Battle Barge of the Ultramarines Space Marine Chapter' (Codex: Space Marines 3rd and 5th Editions); 'In 032.M31, the Octavius carried the cyclonic torpedoes used in the destruction of Colchis' (Know No Fear, Epilogue); 'still active ten thousand years later in M41. It was used by Marneus Calgar to travel to the world of Ichar IV ... It was later used by an Ultramarines force heading to the Vortengard spiral' (Codex: Tyranids 2nd Edition p. 12; Catechism of Hate ch. 1). NAME-COLLISION CHECK: Lexicanum Octavius_(disambiguation) lists this Battle Barge and five PEOPLE (two Ultramarines, a Grey Knight, an Imperial Guard colonel, an Imperial Fist) and notes 'Octavius' as a variant spelling of the Ork empire Octarius; no index record uses 'octavius' or 'octarius'. This record is the Battle Barge only.
classhigh
type ship, no archetype: the dataset has no Battle Barge hull family, and Victus, the Flesh Tearers' Battle Barge, carries none either.
positionsmedium
m41, the Ichar system: Calgar 'arrived 39 days later aboard the space marine battle barge, Octavius' at Ichar IV in 993.M41 (Lexicanum List_of_Battles_of_the_Ultramarines; Octavius, Codex: Tyranids 2nd Edition), bookRef null because that is not this book's scene. The Catechism of Hate council happens en route to the Vortengard Spiral (Lexicanum Gerad_Ixion, ch. 1), which has no Lexicanum article and no published position.
book-joinhigh
VISITED for Catechism of Hate: 'A meeting was called to decide what to do on the Octavius', where Cassius argues for Styxia Prime and Ixion against (Lexicanum Gerad_Ixion, ch. 1; Lexicanum Octavius, ch. 1).
erashigh
m41 only. The 032.M31 Colchis episode (Know No Fear, Epilogue) is recorded in identity but not drawn as an hh era, because no Heresy book on the shelf is joined to the ship. Allegiance 'imperium'.