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{{Character|Portal ={{UltramarinesPortal}}|Name =Dio Promus|Image =|Caption =|Title =|Homeworld =|Birth =c. [[M30]]|Active Period =[[M30]] - ???.[[M31]]|Death =[[M31]]|Cause of Death =Killed by the forces of [[Bodvar Bjarki]]|Species =[[Human]]|Type =[[Astartes]]|Gender =Male|Relatives =[[Roboute Guilliman]] <small>("Father" via [[gene-seed]])|Occupation ='' ''*[[Chief Librarian]] of the [[Ultramarines]]*Member of the [[Knights-Errant]]|Preceded by =|Succeeded by =|Faction ='' ''*[[Imperium of Man]]**[[Ultramarines]]**[[Knights-Errant]]|Notes =}}
'''Dio {{PAGENAME}}''' was the [[Chief Librarian]] of the [[Ultramarines]] during the [[Great Crusade]]. He voted in favor of a Legion [[Librarius (Fortress-monastery)|Librarius]] during the [[Council of Nikaea]].{{Fn|1}} He later was recruited into the [[Knights-Errant]].{{Fn|2b}}
===History===
As a member of the Knights-Errant, Promus was tasked with Malcador to select Candidates for the [[Grey Knights|Titan Project]], killing those who were seen as too mentally weak.{{Fn|2b}} Promus went on to lead a mission at the orders of Malcador to recover the [[Shards of Magnus]]. Accompanied by [[Yasu Nagasena]] and a group of [[Space Wolves]] led by [[Bodvar Bjarki]], their mission brought them to [[Kamiti Sona]], [[Aghoru]], and finally [[Nikaea]] against the [[Thousand Sons]] Cabal of [[Ahriman]].{{Fn|2a}} On [[Nikaea]] Promus was struck down trying to fight a shard of [[Magnus]] where he was blasted by Magnus's power, but [[Yasu Nagasena]] stepped in to protect him from a swarm of [[daemons]]. After the shards of Magnus merged and left for the [[Planet of Sorcerers]], Promus was confronted by Bjarki who learned of his past murders of loyalist Legionaries from [[Fateweaver|Fatewoven]]. Promus admitted the daemon's claims were true to Bjarki but refused to explain the secrets he was bound to keep. On the orders of Bjarki, [[Svafnir Rackwulf]] ended his life in response. His friend [[Lemuel Gaumon]] then took his name as his own.{{fn|2a}}
==={{Endn|Conflicting sources}}===
According to earlier sources such as the novel [[The Chapter's Due (Novel)|The Chapter's Due]], [[Ptolemy]] was the Ultramarines Chief Librarian during the [[Council of Nikaea]].{{Fn|3}}
===See Also=====Related Articles===
*[[List of Librarians]]
===Sources===
*{{Endn|1}}: [[A Thousand Sons (Novel)]] Chapter 20
*2: [[The Crimson King (Novel)]]
