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From Warhammer 40k - Lexicanum
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**This suggests that the two unknown primarchs had been found previously and that something tragic had happened. The two primarchs were "absent" but not referred as "dead".
*All primarchs were tempted by Chaos predations, and "fully half" of them failed that test.<sup>5</sup>
**This suggests that possibly 10 primarchs were, in some way, corrupted by Chaos influences. The known traitors are nine ([[Fulgrim]], [[Perturabo]], [[Konrad Curze]], [[Angron]], [[Mortarion]], [[Magnus]], [[Horus]], [[Lorgar]], and [[Alpharius]]). Whether an additional primarch was corrupted or not is unclear.
*Horus convinced "no less than 9" Space Marine Legions to side with him at the onset of the Heresy,<sup>8</sup> a number also referred to as "fully half" of the legions.<sup>9</sup> When he assaulted Terra, this number was given as 9.<sup>10</sup>
**This also implies, but does not categorically states, that the 9 known traitor legions are all of the legions that followed him into rebellion and that 18 legions were the total number of legions active at the time. A passage detailing Horus' plans for the various legions at the outset of the Heresy mentions by name all 18 known legions<sup>11</sup>.
