Outlander series This, together with the sight of Brianna's photograph – stolen by Geillis from Jamie's collection – having been burned in some sort of ritual, confirms that Geillis intends to travel through time again and find Brianna, whom she now believes to be the heir of Lovat's line.
She Had A Cause. For better or worse, Geillis is motivated by a Cause with a capital C — she wants a Scottish person on the British throne, what she believes to be her countrypeople's right. As she tells Claire shortly before her death, "We are the chosen, you and I.
We catch up with her 20 years later when Claire heads back through the stones and ends up in Jamaica while searching for Young Ian. This is when Geillis learns that there is a way to travel again. She also finds out about Brianna. While younger Geillis had met Brianna, she would have had no idea who Brianna was.
Geillis wants those three sapphires in particular because apparently there's a prophecy that states that when a seer holds all three, he/she will be able to foretell when the new Scottish king will rise. “And if it's 500 years hence,” asks Archie mystified.
Geillis and the reverend then have a conversation discussing Margaret's vision, so as to plainly lay out for viewers what that all means. Basically, it means that a child who is born 200 years after he or she was conceived must be "cut down" and then a new Scottish king will rise.
Laoghaire goes completely nuts. She tells Brianna her mother is a witch who should have burned at the stake, that she bewitched Jamie and nastily tells her that Jamie never wanted a child, so he sent Claire away. She locks Brianna up.
William Buccleigh MacKenzie is the illegitimate son of Dougal MacKenzie and Geillis Duncan, and was raised by William John and Sarah MacKenzie. He and his wife emigrated to America with their infant son, Jeremiah.
Some think Jamie's spirit (but not his body) traveled to through time to guide Claire to him; others suggest Jamie had a near-death experience after the Battle of Culloden, and that's why his ghost is 25 when he appears to Frank.
Roger does run into Geillis's son with Dougal MacKenzie, though. Geillis and Dougal's son was adopted by a family in Cranesmuir, and he grow up to be William Buccleigh MacKenzie, also known as Buck.
Unable to sleep, Claire heads to Colum's library to borrow a book, and ends up eavesdropping on a conversation between Colum and Dougal. She discerns that Dougal has gotten Laoghaire pregnant.
Jenny meets Brianna Randall Fraser for the first time at Lallybroch, when the girl travels into the 18th century to search for her parents. Jenny is delighted at seeing that Jamie fathered a daughter as they had never expected him to have children, and marvels at Brianna likeness to him.
The simple answer is no. Claire and Jamie don't have any more children after Brianna. Claire heads through the stones while pregnant with Brianna at the end of the second season/book. She spends 20 years in the 20th century, and she and Frank don't have any children together.
Geillis gave birth to the baby, who was given to William John and Sarah MacKenzie, the couple whose baby had been “taken by the faeries.” After that Dougal was able to smuggle her out. That's really not that surprising.
A Breath of Snow and Ashes
Henri-Christian is born as the fourth child of Fergus and Marsali. He is a dwarf and some of the residents of Fraser's Ridge believe he is a punishment for his parents' sins. Henri-Christian is placed in a basket and put into a stream by some boys.
Claire beheaded Geillis in a tense fight after it looked like the time traveller was trying to go back through time and change the course of Scotland's history. She seemed to have become more crazed and zealous in her endeavours to stop the English, going so far as to rape and murder to achieve her ends.
Arthur Duncan was the procurator fiscal for Cranesmuir, a village near Castle Leoch. His wife, Geillis Duncan, was a charming woman to whom many go for herbal remedies to their ailments, though she was thought to be a witch.
But it turns out that Dougal MacKenzie pulled a switcheroo to save Geillis and their unborn child after the trial, and ever since then, Geillis has been working on a scheme to see a Scottish king regain power -- a quest that has taken her to Jamaica, where she's been killing virginal boys and searching for a special ...
Abernathy (aka Geillis), who is looking for a stone only found in virgins. Ian survives because he is not a virgin, but is sexually assaulted by Geillis who drugs him and rapes him. Eventually, Jamie and Claire rescue Young Ian at the end of Season 3, and they all move to Fraser's Ridge together in Season 4.
Not knowing who she was speaking to, Brianna told Laoghaire that Claire Fraser is her mother. Laoghaire locked Brianna in the room she was staying in and vowed to have her arrested for witchcraft like she had done with Claire. Joanie let her out and took her to Lallybroch.
Roger is a descendant of Geillis and Dougal's son. Roger has Geillis's green eyes and inherited her ability to pass through the stones. He meets her in 1739, having traveled through time in search of his son, Jem.
Geillis did her research and would have likely come across the newspaper clipping of Claire. Geillis wouldn't have been 100% certain Claire was the Claire from the newspaper clipping, though.
In Scotland in 1968, Claire tells Roger Wakefield that Geillis Duncan was his ancestor and that she was burned as a witch in 1743.
Geillis Duncan was tortured with the pilliwinkes on her fingers and by binding or winching her head with a cord or roape.
In Diana Gabaldon's books, Geillis makes a return albeit as a younger version of herself. The character turns up in the novel Written In My Heart's Own Blood when Roger MacKenzie (Richard Rankin) goes back in time to find his abducted son.
In the 18th century, Claire winds up married to James Alexander Malcolm MacKenzie Fraser, of Clan Fraser of Lovat. They have several children: Faith, who doesn't survive birth; an adopted son named Fergus; and a daughter, Brianna.