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In the novella [[Fury of Magnus (Novella)|Fury of Magnus]], [[Alivia Sureka]] recalls, during her meeting with [[Magnus the Red]], how she had previously met four other Primarchs: [[Horus Lupercal]], [[Roboute Guilliman]], [[Corvus Corax]], and "one whose name she had sworn never to speak".{{Fn|56}} The latter may have been one of the two lost Primarchs, as various other people had also been ordered to never speak their names, or to discuss them and their Legions, after they were expunged from Imperial records.{{Fn|18b}}{{Fn|40}}{{Fn|42}}

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}}