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Rylanor, known as Ancient Rylanor and Rylanor the Unyielding, was a Venerable Dreadnought and hero of the Emperor's Children Legion during the Great Crusade.

He served as the IIIrd Legion's "Ancient of Rites," and had been mortally wounded battling the Aeldari in the late 30th Millennium, solar decades before the outbreak of the Horus Heresy. Following his wounding, Rylanor was interred within the adamantium shell of a Contemptor Pattern Dreadnought. Betrayed unto his own death by the duplicitous actions of the Warmaster Horus, Rylanor rallied the surviving Loyalist Emperor's Children and fought against the Traitors during the Battle of Isstvan III.
He would survive the battle, and spent the next ten thousand Terran years planning to gain vengeance upon the man he truly blamed for the great betrayal - his own Primarch, Fulgrim.