'''Lysimachus Cestus''' was a [[Space Marine Captain|Captain]] and Fleet Commander of the [[Ultramarines]] [[Space Marine Legion|Legion]]'s [[7th Chapter (Ultramarines Legion)|7th Chapter]] during the latter stages of the [[Great Crusade]] and the early stages of the [[Horus Heresy]]. He is most famous for leading the interception mission against the ''[[Furious Abyss]]'', the giant dreadnought vessel of the [[Word Bearers]], and ensuring its destruction before it could play a role in the [[Battle of Calth]].{{Fn|1}}

{{spoiler|source=Battle for the Abyss (Novel)}}

A native of [[Macragge]], Cestus competed at the [[Fortress of Hera|Temple of Hera]] to be selected for Space Marine training. He put his success down to his determination and willpower, qualities that would come to define him in his later career.{{Fn|1}}

Cestus faced one final disappointment generated by his chosen course of action when he was challenged for command of the venture by the leader of the Space Wolf contingent of his force, [[Brynngar Sturmdreng]]. Defeating the [[Wolf Guard]] in combat, Cestus was able to lead the final assault on the ''Furious Abyss'', when the ''Wrathful'' caught up with it in the [[Macragge system]]. A desperate boarding action was ultimately successful, principally due to the valour and combat-skills of Cestus, Brynngar and Skraal, who together managed to begin a process that resulted in the ship's self-destruction. Cestus himself was able to kill [[Zadkiel (Word Bearers)|Zadkiel]], the Captain of the Word Bearers ship, although he was mortally wounded in return. He perished, duty done, as the ''Furious Abyss'' blew herself to pieces just short of the intended combat zone.{{Fn|1}}

The model of an Ultramarine in appearance, Cestus was decked out in ornate gold-edged [[Power armour]] and equipped with a [[bolter]], [[power sword]] and [[gladius]]. Additionally, Cestus wore a silver laurel wreath about his forehead.{{Fn|1}}

Cestus was possessed of a great store of 'intellectual faith', where his willpower appeared to be so strong that he could convince himself of the certainty of his beliefs despite little evidence existing to back him up. His will was also strong enough that he was able to convince other Astartes to go along with his intentions despite dubious circumstances.{{Fn|1}}

*'''Cestus''': Honour Guard Commander, Fleet Commander and Captain. Died of wounds inflicted aboard the ''Furious Abyss''.

*[[Antiges]]: Second-in-command and friend to Cestus for over 20 years. Killed in action whilst attempting to sabotage the ''Furious Abyss''.

*[[Thestor]]: Armed with a ([[Heavy Bolter]]). Physically larger than a typical Astartes, he expressed disdain towards the World Eaters. Killed during a daemonic incursion aboard the ''Wrathful''.

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*{{Endn|2}}: [[The Horus Heresy: Legions]]