Shae is a prostitute who has begun an exclusive relationship with Tyrion Lannister during the time when he was fighting in the Lannister army as part of the Vanguard during the Battle of the Green Fork. When he is sent to King's Landing to be acting Hand of the King, he takes Shae with him as his mistress in defiance of his father's orders, and she lives with him at the Tower of the Hand. The only person who knows she is there is Varys the Master of Whisperers, who while not completely trusted was an advisor to Tyrion and did seem to keep their secret.
When Shae is bored, Tyrion arranged for her to work as a handmaiden to Sansa Stark, where she acts as confidant through the difficulties of Joffrey's abuse and the siege of Stannis Baratheon. Queen Cersei is threatening Tyrion and his fear for Shae's safety makes him realize how much he has come to love her. After the Battle of the Blackwater with Tyrion injured and no longer Hand of the King, she urges him to flee with her to Pentos. When he tells her his place is here, she agrees to stay with him. However, their relationship comes under strain when Tyrion is forcibly married to Sansa, inciting Shae's jealousy despite Sansa and Tyrion never consummating their marriage.
Fearing for her safety, Tyrion eventually sends her away, insulting her in the process. However, she is intercepted before leaving the capital and gives vengeful (but false) testimony against Tyrion, whom she considers has betrayed her to remain with Sansa, at his trial for the assassination of King Joffrey, in the process having an affair with Tyrion's father, Tywin. This betrayal proves to be too much of a blow towards Tyrion, who kills both Shae and Tywin in revenge.
Shae is a young woman of mystery, as she won't divulge her true origins. She has a Lorathi accent and is obviously not native to Westeros: she says she arrived there ten years ago. She is first encountered as a camp-follower with the Lannister army in the Riverlands. She has dreams of wealth and power, despite her low social status as a kept woman. She hails from the Free City of Lorath.
At unspecified points in the past, Shae has been to Dorne and Volantis.
Shae is a camp-follower whom Bronn a sellsword in the service of Tyrion Lannister finds as per Tyrion's request. She is attached to a ginger-haired Knight, but Bronn "persuades" him to give her up to Tyrion Lannister, who is fighting with the army of Lannister in the Riverlands. He is charmed by her immediately. He tells her he wants the truth, but also that he wants her to act as if she wants him and that it's their last night on earth together. Tyrion plays a drinking game with her and Bronn in an attempt to learn more about Shae's past, but she refuses to reveal specifics. Tyrion tells her that he thinks her mother was a whore and her father deserted them, she says emphatically that he is wrong, and she doesn't want to speak of them. He seems more on the mark when he talks of her ambitions until he gets to the part of saying she was low born, she indicates he is wrong, thus she was not low-born. Shae deflects Tyrion's questions and learns about his past instead, particularly the incident involving his marriage to Tysha. When Tyrion was 16 he fell in love and secretly married a young wheelwright's daughter who he helped protect from two rapers, but the girl turned out to be a prostitute hired by Jaime Lannister to make a man of him. When Tywin Lannister found out he had the marriage annulled and the girl gang-raped by his guards. Shae says he should have known she was a whore as a girl doesn't invite another man into her bed after almost being raped.
Following a victory in the Battle of the Green Fork Tyrion is made acting Hand of the King by his father Tywin Lannister. Tywin had been named as Hand to his grandson Joffrey Baratheon, but due to the war he must remain with his army in the field. Tywin forbade Tyrion taking Shae to court. Tyrion complains about his father to Shae, then decides to defy his order, much to her delight.
Shae accompanies Tyrion to King's Landing and he installs her secretly in the Tower of the Hand. Varys discovers Shae's presence and subtly threatens Tyrion with the information. Shae tells Varys that Tyrion met her when she was employed in his father's kitchens. Shae becomes increasingly fed up at her confinement and Tyrion arranges for her to serve as a handmaiden to the captive Sansa Stark. Sansa comes to trust Shae and confides her hatred of King Joffrey Baratheon after she is injured in the Riot of King's Landing. Shae warns her to trust no-one.
Shae discovers Sansa trying to conceal evidence of her first period because it means she is ready to bear Joffrey's children. Shae helps her, even threatens a maid into silence when she walks in on them, but they are discovered by Sandor Clegane. Sansa is taken before Queen Cersei.
Shae is bemused when Tyrion rushes in especially tender and protective with her and wanting to exchange words of love, "I am yours, and you are mine"; unbeknownst to her Queen Cersei has imprisoned and threatened the prostitute Ros mistakenly believing that she is Tyrion's current lover. Tyrion is overjoyed that Shae is safe, as she has come to be important to him.
Shae spends the night before the Battle of the Blackwater in Tyrion's bed. Tyrion tells her that she could flee but she asserts her loyalty to him. When the bells sound the arrival of the attacking force she goes to the Throne Room with Sansa. She has an awkward public goodbye with Tyrion, who is careful not to acknowledge their relationship. Sansa and Shae take refuge in Maegor's Holdfast during the battle, hosted with the women of the court by Cersei. Cersei realizes that Shae is new and questions her origins. She recognizes her lowborn status when she cannot curtsey properly and discerns that she is from Lorath. She asks Shae to explain how she came to be Sansa's handmaiden, but her attention is diverted by news of the battle. When the battle seems lost Cersei storms out of the room. Shae advises Sansa to bar herself in her chamber to keep her safe should the city be sacked, as Stannis will not hurt her, but Ser Ilyn Payne, who guards them, has Cersei's orders to kill her if the city falls. Sansa asks what Shae will do and she says that she has to say goodbye to a friend. Sansa worries for her safety and she shows her that she is carrying a concealed blade.
Tyrion is betrayed and grievously wounded during the fighting. His defensive tactics buy enough time for reinforcements to arrive and win the battle. Varys brings Shae to see Tyrion, who has been ousted as Hand of the King and stripped of his allies while he has been incapacitated. She unflinchingly assesses his horrific facial scar and chastises him for self-pity. She begs him to go with her to Pentos but he refuses, saying that he is good at, and enjoys, playing politics. She reaffirms her love for him and comforts him.
Sansa Stark and Shae sit on the docks watching ships arrive and depart. Sansa wants to play a game making up stories about where the ships are headed, but Shae is uninterested. Then, Petyr Baelish arrives with Ross and suggests to Sansa that, when he next leaves the capital by sea, she might be able to stow away. Meanwhile, Ros, who seems to be acting as Littlefinger's aide, reminisces about the day Sansa was born, when all the bells in Winterfell were rung in celebration. She asks Shae to watch out for Sansa, particularly in regards to Littlefinger. Shae replies that she is always watching out for her.
While Shae dresses Sansa Stark in her chambers, she heeds Ros's advice and warns Sansa about Littlefinger, pointing out that Baelish has offered to help Sansa for nothing in return because he's after something. Sansa naively says that he's an old friend of her mother's, believing that should be reason enough, but Shae suggests that Baelish is actually sexually attracted to Sansa. This disturbs Sansa, but she thinks it is simply impossible, as Baelish is so much older than her. Shae continues to warn Sansa that Baelish is manipulative and men usually only want "one thing" from pretty young ladies, and "love" often isn't what they're after. Later, Shae sneaks into Tyrion Lannister's new chambers and, despite his warnings that his father threatened to kill her if he found her with him again, Shae starts undressing Tyrion and asks him to protect Sansa from Baelish. Tyrion says that he doesn't have enough power or influence any more to attempt to do that, though Shae accuses him of being attracted to Sansa, which he cheerfully denies. It also comes out that Tyrion had sex with Ros back in the North, though Tyrion points out it was before he met Shae. They playfully bicker about it as they start having sex.
When Tyrion is forcibly promised to wed Sansa Stark by his father, he decides to go to Sansa's chamber but finds Shae with her. He asks for a private word, but Shae wants to be there and Sansa declines to dismiss her. Tyrion gives Shae a carefully coded apology for not telling her in private before breaking the news to Sansa. Later, while Littlefinger departs the city without Sansa, Shae is with her as she weeps looking at his outgoing ship. Having found out that Tyrion and Sansa are to be wed, she gets extremely annoyed with Tyrion, because she realizes that she will see him less and thinks he might be attracted to Sansa. Tyrion gives her golden chains as a gift, but she immediately refuses to accept them and says she is nothing more than a whore to him.
After Tyrion's wedding night, Shae angrily comes into the chamber to take the bedsheets but, when she sees no sign that their marriage was consummated, she is pleased.
Shae is in the gardens watching the ships in the bay when Varys comes to speak with her. He tells her that she can't spend her life with Tyrion even though she obviously loves him, because Tyrion is the last hope for the Seven Kingdoms' current regime Shae is his greatest weakness, which neither Tyrion nor the realm can afford. Varys offers her diamonds with a prospect of a new life across the Narrow Sea in Pentos, where she can start anew. However, Shae confirms that she is in love with Tyrion and that she cares deeply for Sansa as well and that, in spite of her pain at seeing them together and the danger she poses, Shae will not leave until or unless Tyrion asks her to. Shae throws the little bag with diamonds at his feet.
When Tyrion comes to speak with Sansa during her breakfast, he sends Shae away, so he may be with Sansa alone and try to comfort her. Sansa is still mourning her mother and brother, who were murdered at the Red Wedding. As she leaves, she turns around with a jealous look. Shae waits for Tyrion in his chambers and when he comes in, she tries to seduce him. However, he tells her that it is not a good time and says he has far too many problems. She is nervous because he already has rejected her many times in the same fashion and she is afraid that he does not love her anymore. Tyrion assures her that she is the only woman he loves and Sansa is only a child whom he had to marry. Then she furiously mentions that Varys tried to give her diamonds for her departure and asks if Tyrion had anything to do with it. After a moment of silence, she leaves the room very annoyed. Her presence is noticed by Cersei's spy, who immediately goes to tell the Queen about Shae.
On the day of the Royal Wedding, a breakfast is hosted by Joffrey and Margaery and Shae is present. Cersei informs her father that Shae is the whore that Tyrion brought to the capital against his wishes. Varys meets Tyrion and tells him that he has friends across the Narrow Sea who could help Shae if she were to leave King's Landing. Tyrion is reluctant at first, but when Varys reminds him of Tywin's threat, he starts to consider the option. Cersei spots her and tells Tywin that she is the whore she told him about. He then tells Cersei to have Shae brought to the Tower of the Hand before the wedding. Shae visits Tyrion is his chambers again and he tells her she will leave with the ship that is waiting for her in the bay. She assures him that she isn't afraid and is willing to fight Cersei and Tywin together with Tyrion, but he tells her that she is a whore, while he is a married man and although he enjoyed the time spent with her, that time is over. She starts to cry heavily. Tyrion tells her that she will have a comfortable life in Pentos and Bronn will escort her to her ship. When Bronn tries to touch her, she slaps him and runs away. When Tyron later asks Bronn if she is gone, he says that she boarded the ship. When Tyrion asks if he saw it sail away, Bronn assures him that no one has been following him while escorting her, that she is gone and no one knows about it except the two of them and Varys. He then advises Tyrion to go drink until it feels like he did the right thing.
During the trial against Tyrion for the murder of King Joffrey, Shae appears as the final witness of the crown, clearly having been found by Cersei's agents. She accuses Tyrion of having kidnapped her and forced her to become his whore and then that she witnessed Tyrion and Sansa plan the murder together, accusing Sansa of desiring revenge and forcing Tyrion into cooperating by denying him entrance into her bed. Broken, Tyrion pleads with Shae to stop, only for her to remind him that she's a whore. Her testimony is the final straw for Tyrion, who snaps and hisses at the crowd that watching Joffrey die was more pleasurable than "a thousand lying whores". He repudiates his father's deal for him to join the Night's Watch in return for a mercy plea, and instead demands a trial by combat.
Later on, after Tyrion is broken free by Jaime Lannister, he stops and goes to the tower of the hand with the intent of murdering his father, only to discover Shae is lying in his bed wearing the golden chains Tyrion gifted to her. She sees him and grabs a knife to kill him, but Tyrion jumps on her and they struggle for a while. Upon realising that Shae intends to kill him, Tyrion retaliates and by grabbing the chain and strangling her to death with it. Horrified at what he has done, Tyrion silently apologises to Shae's corpse, and takes Joffrey's crossbow from the wall and goes on to murder Tywin in the privy after the latter calls Shae a "whore" once too many times.
Shae is a camp follower who made an immediate impression on Tyrion Lannister. Tyrion brought Shae with him to King's Landing but abandoned her after he married Sansa Stark. Shae then denounced Tyrion when he stood trial for the murder of king Joffrey. Tyrion killed her when he found her in his father's bed.