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In the Forge World book [[The Horus Heresy Book One - Betrayal]], the Primarchs and their Legions are listed in a table with the names of the II and XI Legions and Primarchs blacked out only as far as the text concealed. The length of these black lines indicates that the name of the II Legion is quite long, only just shorter than "Emperor's Children" and the name of the XI Legion is about the same length as "Thousand Sons". The name of the II Primarch is approximately as long as "Alpharius" (also suggesting just a single name) and the name of the XI Primarch is about the same length as "Magnus the Red" (suggesting either two names or one with a title). The On the same page, the book also states that "Of these twenty Legions, steadily expanding in numbers over time, eighteen would survive to grow into vast forces by the end of the Great Crusade - as to those that did not, nothing can be said in this record."{{Fn|2424c}}

Also, on in a section of the book discussing the Primarchs, the author notes that {{QuoteBox|quote = Over the course of the Great Crusade the Emperor was reunited with each Primarch in turn and, save two whose secrets are far beyond this record, each was sooner or later placed in command of one of the Emperor's Space Marine Legions as its master, second only in authority to the Emperor itself.{{Fn|24b}}|align=center}} This suggests that the two lost Primarchs never led their respective Legions before being purged from Imperial records. However, this seemingly contradicts the story [[The Chamber at the End of Memory]], where [[Malcador the Sigillite]], one of the few who still remembers what happened to the Primarchs, states that whatever fate befell them left their Legions' Space Marines adrift and leaderless, implying that they had led them beforehand.{{Fn|36}} It also contradicts the inside cover there novel [[Fulgrim: The Palatine Phoenix (Novel)|Fulgrim: The Palatine Phoenix]], where Fulgrim explicitly refers to the Primarch of the II Legion, his "quiet brother", as the "Master of the Second".{{Fn|42}} The book also includes is a Galactic Map of the Great Crusade era Imperium, circa 892.005.M31. All the important planets, [[Calth]], [[Terra]], [[Fenris]], [[Prospero]], [[Baal]], [[Inwit]], [[Hellion]], etc... are listed. Every known Primarchs' homeworld is shown in its respective location. However, in the [[Segmentum Pacificus]] there's a spot known as the "Finding of the Lost Son". This could be a reference to [[Alpharius]] as he was the last to be found and his homeworld never revealed, or it could reference where one of the lost Primarchs were originally found.{{Fn|24a}}

*{{Endn|24}}: [[The Horus Heresy Book One - Betrayal]]*{{Endn|24a}}: Dominatus Imperialis, pgs. 10-11*{{Endn|24b}}: The Legiones Astartes, pg. 18*{{Endn|24c}}: The Legiones Astartes, pg. 29