This archive tracks four layers. A record present in 4 of them (HH, AoI, M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
imperium
In the VII Legion's fleet
A Gloriana that fought the Great Crusade under Rogal Dorn and was reckoned one of his favourites. Nothing published stations it anywhere in particular during the Heresy itself.
Position in this era: [RECORD LOST].
Age of the ImperiumM32–M40
imperium
Flagship of the Black Templars
Dorn handed it to Sigismund at the Second Founding as the thing the new Chapter would live aboard instead of a homeworld. The Black Legion boarded it at Cadia in the First Black Crusade and nearly took it; a century of war later it was still in dock at Cypra Mundi when the orks reached Terra.
Position: Cadian System (Cadia) Boarded during the First Battle of Cadia; Abaddon's assault reached the decks and was called off only after Sigismund wounded him and a second traitor fleet arrived behind the Black Legion Cited in Black Legion
Position: Cypra Mundi System (Cypra Mundi) In the shipyards for a refit that still had twenty years to run when the War of the Beast broke; the Chapter flag moved to the Abhorrence rather than wait Cited in Throneworld
The 41st Millenniumpre-Rift
imperium
Flagship of the Black Templars
Lead ship of the Astartes fleet that met Ghazghkull's roks over Armageddon. It is where the High Marshal lives, and it carries most of what the Chapter owns.
Position: Armageddon System (Armageddon) Lead ship of the combined Space Marine fleet in the opening void actions of the Third War for Armageddon Cited in Helsreach
Era Indomituspost-Rift
imperium
Flagship of the Black Templars
Fought the Conqueror over Armageddon in the Season of Blood and came off badly enough to withdraw for repairs — the first time in ten thousand years the two hulls are recorded meeting.
Position: Armageddon System (Armageddon) Engaged the Chaos fleet in orbit alongside the Allfather's Honour during the Season of Blood, and withdrew damaged
Position
A mobile record: it carries a position timeline rather than a fixed point. The archive places it in 3 of the four eras (AoI, M41, IND); each era section above carries that era's entry.
Books set here
5 titles in the reading tracker touch this record, 1 of them as a primary location. Titles link out to the tracker.
wh40k.lexicanum.com/wiki/Eternal_Crusader §History, whose own citations are books this tracker carries: Throneworld ch1 for the Great Crusade service and the Cypra Mundi refit, Black Legion XII–XV for the Cadian boarding, Helsreach I–III for the Third War for Armageddon
position-hhhigh
[RECORD LOST] — the ship is placed in the Imperial Fists fleet for the Great Crusade and nowhere more precisely. No era-hh position is drawn rather than inventing a station for it
position-indomitusmedium
the Season of Blood engagement is published in a campaign supplement (Crusade: Armageddon pg. 39), not in a tracked novel, so the position carries no bookRef. The system is stated outright in that source
archetypehigh
catalogue entry 8, crusade carrier fortress — the reference tag is this vessel by name. Note the tension worth recording: canon calls it a Gloriana, while the brief describes a shorter, thicker, more rectangular hull than the Gloriana family. The brief wins here because the brief is what the mesh lane built