Names: We first know her as Geillis (Geilie) Duncan in the 1740's, but also Geillis Isbister in 1739, Gillian Edgars (married to Greg Edgars) in the 1960's, Melisande Robicheaux in France, and Geillis Abernathy (married to Barnabas Abernathy in the 1760's in West Indies. She told Claire she has had 5 husbands, and we know she has killed at least 3 of them (Greg Edgars, Arthur Duncan, and Barnabas Abernathy). Don't know much about Geilie's past. She went back in time through the standing stones at Craigh na Dun on May 1, 1968 and ended up in 1733 (or was it 1739 per Written in My Own Hearts Blood), about 10 years earlier than intended. There is mention that she was Geillis Isbister in 1739 but he died shortly thereafter. Then she married Arthur Duncan who was the Fiscal for the Clan MacKenzie. He wasn't much to look at, but he had a fine house in Cranesmuir (just outside Castle Leoch) and a good enough income to be able to siphon money (about 10,000 pounds) to the Stuart cause. She had a vast knowledge of herbal medicine, and used it for both good and evil. She became pregnant accidentally by Dougal MacKenzie and was sentenced to death for witchcraft in S01-E11, which she admitted to. But in the book she was allowed to live long enough to give birth to a son in the bedroom of her house in Cranesmuir. Dougal took the baby and gave it to William and Sarah MacKenzie who had just lost a baby boy to smallpox (both were named William Buccleigh). Then he helped Geillis to fake her death by burning in oil and escape to France. While in France she was known as Melisande Robicheaux and one of her lovers was the Comte St. Germain. She somehow made it to Jamaica and married a man named Barnabas Abernathy who had a sugar cane and coffee plantation named Rose Hall. That was about 1764. She killed him six months later using poison. Along the way, she had gotten rather plump. She had an unnatural fascination with young boys, and kidnapped a number of them from Scotland and held them prisoner, including Jamie's young nephew Ian. She died in a cave on the island of Haiti in 1766.