- "I told her that, as she no longer had a master, her freedom would begin by choosing a name for herself. She laughed – she has the most delightful laugh! – then she told me that her name was Abigail."
- ―Achilles reflecting on his first meeting with Abigail, 1744.[src]
Born a slave in the West Indies, the woman was brought to the North American colonies in 1742. The government had made her the wife of the executioner Mathieu Léveillé, in the hope that her presence would cure his depression. However, due to the risks of infection, she was scarcely allowed in Léveillé's presence; nonetheless, Léveillé confided in her his knowledge on the First Civilization and she promised to keep it safe.
After Léveillé's death, she was baptized Angélique-Denise and subsequently put up for sale. On 10 May 1744, she was purchased by the Assassin John de la Tour, who suspected she possessed the information he had come to Quebec for. Angélique subsequently became acquainted with de la Tour and his fellow Assassin Achilles Davenport, whose prompting inspired her to change her name to Abigail. In the next year, she and Achilles grew closer.
In 1745, Abigail and Achilles traveled with de la Tour to the fortress of Louisbourg in search of Nicolas Court's safe house, posing as de la Tour's slaves so that he would appear incredibly wealthy. As English troops descended on Louisbourg, Achilles and de la Tour prepared for the attack, while Abigail continued looking for Court's hiding place, eventually locating it. However, the safe house was empty safe for a cryptic message that led Achilles to decide to start his Brotherhood in New York.
Abigail and Achilles married at some point and had a son, whom they named Connor. However, sometime after the French and Indian War had begun, she and her son died of typhoid fever, and the pair were later buried on a hill next to the Davenport Homestead. Following this, Abigail was eventually joined in death by her husband in 1781.
- Abigail's given date of death is inconsistent: in Assassin's Creed III, it is shown as 1755 on her gravestone, which is corroborated by Achilles' database entry in Assassin's Creed: Rogue. However, Rogue also shows Shay Cormac and Liam O'Brien discussing the passing of Abigail in the memory "One Little Victory", which takes place in May 1754.