Belisarius Arius was a male Imperial Assassin and Speaker for the Dark Brotherhood. He spent most of his time doing administrative duties within the Brotherhood. When other members of the Black Hand were systematically murdered, he and the remaining three members mutilated Lucien Lachance as they thought he was the traitor. He was murdered by Mathieu Bellamont, the real traitor, in The Night Mother's Cyrpt, in the year 3E 433.
- The Elder Scrolls IV: Oblivion (First appearance)