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The younger sibling of [[General]] [[Derian Arkelius]], Anastasia Arkelius has enjoyed a more successful career than her older brother, having reached the higher ranks of the Admiralty while still only in her first century. At the beginning of the [[Achilus Crusade]], she served as a Rear Admiral, newly promoted, overseeing the movement of vessels through the [[Jericho-Maw]] [[WarpGate]] Gate and liaising with the [[Battlefleet Calixis]] Admiralty to maintain supply lines. After [[Lord Militant]] [[Achilus]]’ death, Arkelius found herself elevated to Admiral, as Lord Militant [[Tetrarchus]] began to rearrange the Crusade’s command staff. Placed in command of the six Navy [[battlegroup]]s of the [[Orpheus Salient]]—Icarus, Argo, Cerberus, Daedalus, Vishnu and Santos—she was shortly thereafter elevated to Lord Admiral and commander of all Imperial Navy forces within the Salient.{{Fn|1}}

When General Curas was lost, and [[Lord Commissar ]] [[Vance Theren ]] wrought his deception, Lord Admiral Arkelius was the first to be informed and brought into what would become the Triumvirate. To this day, she uses that, and the swiftness of her ascendance to one of the highest ranks in the Imperial Navy, to taunt and bait her elder brother into some rash course of action, maintaining a rivalry that has existed between them since they were children. That she is still willing to antagonize her brother, who is the most powerful Imperial Guard commander in the Salient and extremely valuable to the continued conflict there, demonstrates perhaps her greatest flaw in judgement, placing a long-standing family feud and her own pride above the defence of the Salient’s remaining worlds. Without [[Lord Commissar]] [[Vance Theren]] to mediate disputes between the two, the Orpheus Salient might have collapsed entirely years ago.{{Fn|1}}

As is common amongst the officers of the Imperial Navy, Arkelius regards the [[Space Marine]]s with a mixture of caution and respect. Few officers in the Navy feel comfortable with the Space Marines maintaining their own fleets, and an uncertain peace exists between the Navy and many [[Space Marine Chapters Chapter]]s over the matter of war-fleets. However, Arkelius respects the Space Marines’ prowess and effectiveness, though she is cautious of their ulterior motives. With the [[Deathwatch]], the same is true, though to a greater extent, and she is far from appreciative when her vessels are commandeered for clandestine missions.{{Fn|1}}