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However, the dialogue between [[Lorgar]] and [[Magnus]] in Chapter 10 of ''[[The First Heretic (Novel)|The First Heretic]]'', which takes place no more than seven months after the razing of [[Monarchia]] (listed in that the timeline at as happening in 964.M30), infers that the unknown Legions had been stricken from the records for some time. {{Fn|18b}}{{Fn|27}} If both sources are correct, this would infer that the Legions were still active in some fashion before the Wolves destroyed them.

This The idea of one or more Primarchs being dead is echoed later in Jaghatai Khan's reflections, as he sees the ruins of [[Tizca]] in the aftermath of the [[Burning of Prospero]]:

In the pre-Horus Heresy Primarch series novel [[Fulgrim: The Palatine Phoenix (Novel)|Fulgrim: The Palatine Phoenix]], Fulgrim describes how his seven active rediscovered brothers had all doubted that the Emperor's Children were ready to function as an independent Legion, due to them only having 200 Marines at the time Fulgrim took command. While reflecting on this encounter, he mentions how even the "normally contemplative master of the Second" had broken his silence to join the others and accuse him of hubris. Fulgrim claims that he was a hypocrite for saying this, and describes him as a quiet, and apparently humourless, man.{{Fn|36}}

This apparently refers to the Second Primarch, as Fulgrim mentions the Primarch rediscovery timeline indicates that one of the lost Primarchs was found third, only 23 years after the start of the Crusade (the other being found over halfway through, at 129 years in ),{{Endn|57}} and the novel [[Fulgrim: The Palatine Phoenix (Novel)|Fulgrim: The Palatine Phoenix]] confirms that the Second was among the first eight activefound{{Fn|36}}, which is consistent with the Ymga Monolith expedition occurring in the earlier stages of the Great Crusade. Likewise, the Eleventh Primarch was not discovered until near the end of the Great Crusade.

Later in the novel, Leman Russ talks with [[Kva]] about the [[Emperor]] discovering the Primarchs. When he talks of the discovery of the "third brother" the dialog suddenly cuts off due to [[Warp]] interference. When the conversation is seen resuming Leman Russ calls the tale a tragic one. He then notes that [[Ferrus Manus]] was then found next, followed by the rest.{{Fn|47b}} As the Primarch rediscovery timeline confirms that the other lost Primarch was found nineteenth, and the Second Primarch is noted as one of the first eight found in [[Fulgrim: The Palatine Phoenix (Novel)|Fulgrim: The Palatine Phoenix]], it can be concluded that Russ is referring to the Second.{{Fn|36}}{{Endn|57}}

As Russ mentions that the Emperor was revealing Ferrus Manus as his 'third son', but referred to Ferrus implicitly as fourth elsewhere, this implies that the Primarch actually found third (the Second) was not present. If this is As the Second Primarch - who was established as being one of the first eight Primarchs found in [[Fulgrim: The Palatine Phoenix (Novel)|Fulgrim: The Palatine Phoenix]], and was actively leading his Legion at legion later on, by the time of that novel's eventseight Primarchs had been found{{Fn|36}} - then , this may just mean that the Emperor had chosen not to reveal him yethis rediscovery to the Imperium. This would not be unprecedented, as he is also thought to have kept Vulkan's rediscovery a secret from the general public for several years.{{Fn|27b}}

In the novella [[Daenyathos (Novella)]], the [[Soul Drinkers]] [[Chaplain]] [[Daenyathos]] tells a story about the origins of Space Marine [[Gene-seed|gene-seed]]. He claims that Space Marine gene-seed is made from the flesh of the lost Primarchs, who were despised by their brothers. According to this tale, these two Primarchs were murdered by the other eighteen, and their bodies cut into thousands of pieces, each of which was implanted into a warrior to create one of the first Space Marines. As Daenyatos was trying to tell as dramatic a story as possible in order to distract his captor, an Imperial the heretical [[Missionary]]-turned-heretic named Croivas Ascenian, it is unlikely there was any truth to it, literal or otherwise.{{Fn|51}}

===Timeline of the 31st Millenium (thehorusheresy.com site)===On the official Horus Heresy website, there is a timeline listing a series of events occurring in the late 30th and early 31st millennia, including the rediscovery dates of the various Primarchs. This includes two events, labelled "Discovery of [REDACTED]", dated to the years 821.[[M30]] (third in the Primarch discovery sequence) and 927.M30(nineteenth in the sequence). These are presumably the discovery dates of the two lost Primarchs.{{Fn|57}} If this is the case, then the first of these two events would be the II Legion Primarch's discovery, as [[Fulgrim: The Palatine Phoenix (Novel)]] confirms that the he was among the first eight found.{{Fn|36}}