Warhammer 40K: Space Marine
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Metontour #671 "erased from Imperial records and how Roboute Guilliman's Ultramarines legion mysteriously swelled in numbers each time one of the two legions was "erased." The implication seems clear that at least part of the fighting force of the "lost" legions was entrusted to Roboute Guilliman and incorporated into the Ultramarines"
http://wh40k.lexicanum.com/wiki/Primarchs#Two_unknown_Primarchs
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