Octavia

オクタヴィア

Octavia is a former soldier and aristocrat of the Holy Empire; she now serves under Arawn as one of his many wives following a blunt incident.
When Arthur sent men to transport the crate in which Octavia had been tied and placed by her masters in the Holy Empire, she untied herself, jumped out of the crate, and attempted to assassinate Arawn, but failed. Arawn later released her, but then retracted the promise after realizing that her return to the Holy Empire would only mean her own doom.
Unaware of the customs of the Holy Empire, Arawn grabbed her hand, wanting her to stay by his side—a gesture she interpreted as a marriage proposal. In the Holy Empire, holding an unmarried woman's hand signifies a proposal of marriage.
This sequence of events differed in the anime. Octavia was trapped in one of the crates until Lydia arrived to remind her of their last meeting, when Lydia had defeated her in a duel in the past. When the crate she was in reached Avalon Castle, Arawn demanded that she come out from hiding. She challenged him, but he refused to fight someone who lacked the will to live. Octavia later fainted due to an injury on her hip, and Riannon nursed her.
Arthur, acting under Arawn’s order to assess her character, later challenged her. She subsequently swore by her sword that she would remain there as an independent female swordsman and share the fate of everyone living in Avalon Castle. In the same episode in which all this occurred, she told Arthur that she was an aristocrat, but her family had been murdered because of her father’s rebellion against the Holy Empire. She inherited her elder brother's sword.
After discovering the Red Coral that Morgan was searching for, Octavia had two small pieces made with their names on them as necklaces. Octavia kept Morgan's, while Morgan was given Octavia's, as a sign of their friendship.
During her early stay in Avalon Castle, she volunteered to teach two children, Elyr and Conale, swordsmanship, as well as reading and writing.