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'''Constantin Valdor''' was the Chief Custodian to the [[Emperorof Mankind]] as head [[Captain-General]] of the [[Adeptus Custodes]] at the time of the [[Great Crusade]] and the [[Horus Heresy]].

==Biography==Just prior to the [[Horus Heresy]], Valdor was charged by the [[Emperor]] to accompany [[Leman Russ]] of the [[Space Wolves]] in bringing [[Magnus the Red]] to account for breaking promises made during the [[Council of Nikaea]] at which the Emperor strictly forbade the use of sorcery and psychic powers.²

Valdor, with a contingent of elite Custodian Guard, fought alongside Russ and the Space Wolves on [[Prospero]]. He and his forces were responsible for killing at least three of the greatest psykers of the [[Thousand Sons]] and routing a force much more numerous than their own, however little else is known after this. He was also responsible for saving [[Bjorn]] when his arm was corrupted by the sorcerous powers of a Thousand Sons psyker. Valdor sliced Bjorn's arm off to prevent the corruption from overrunning his body.²

When [[Amon Tauromachian]] returned from his extended [[Blood Game]], Valdor informed his fellow Custodian of how [[Horus|Horus Lupercal]] had declared rebellion against the Emperor. When Tauromachian asked how this could happen, Valdor, speaking as someone who knew the [[Warmaster]], rejected theories that it was pride or resentment, instead voicing his belief that [[Chaos|something]] had driven Horus and his closest advisers mad. Valdor then assigned Tauromachian with the task of investigating [[Pherom Sichar]], Lord of [[Hy Brasil]], for evidence of treason.³ After Horus declared his rebellion, Valdor then oversaw the mission and deployment of the first ever execution team. Invited by the [[Master of Assassins]], one of the [[High Lords of Terra]] whose secret identity was [[Malcador The Sigillite]] Valdor oversaw the council of Assassins. Each clade- [[Venenum]], [[Eversor]], [[Culexus]], [[Vanus]], [[Callidus]], and led by [[Vindicare]] selected a single alpha-dan operative for the mission. The target was [[Horus Lupercal]]. [[Rogal Dorn]] learned of such events and challenged Valdor claiming that Horus being alive was a boon because he was predictable, and killing the head of the rebellion would not stop it, someone more predictable would simply take over. Valdor argued that the actions of the [[Officio Assassinorum]] were not necessarily cowardly, but expedient. Valdor says to Dorn that they all want the same thing; to preserve the EmporerEmperor. Dorn however claims that Valdor's role is to safeguard the life of the Emperor, whilst Dorn himself, and all the [[Astartes]] role is to safeguard the [[Imperium]]. The Assassin's mission uncovered valuable information, and encountered [[Erebus]]' own agent, daemonically enhanced. The mission to kill [[Horus]] is a failure as Horus is tipped off of the attempt on his life and sends a proxy who is killed in his place. Dorn and Valdor continue to argue, Dorn citing that to preserve the Imperium we must have a moral code, Valdor citing that to match Horus evil we must not stop at underhanded tactics. The [[Emperor]] settles the argument with the final statement 'No more shadows. No more veils'. It appears that Horus comes to the same conclusion far from Terra; suggesting that it was not Dorn, but the Emperor who told Horus of the assassination attempt and they mutually agree to abstain from such tactics. ¹

*¹: [[Nemesis (Novel)]] by James Swallow*²: [[Horus Heresy: Collected Visions]], pp. 236-241*¹³ : [[Nemesis (Novel)Tales of Heresy|Tales of Heresy: Blood Game]] by James Swallow