Tatiana Lightwood was born as the youngest child of Barbara and Benedict Lightwood in 1862. Since her mother died around a year after her birth, Tatiana was raised protectively by her father, who shielded her from his activities and taught her that she would grow up into an elegant woman who would support her Shadowhunter husband and do her duty by having more Shadowhunter children. In addition, Tatiana was extremely bitter about not having met her mother and blamed her absence on her brothers.
As a child, Tatiana developed a huge crush on the London Institute's new ward, Will Herondale. At a Christmas party at the Institute, when she was around eleven or twelve, Will found her diary, which contained poems of her love for him and her name, written as "Tatiana Herondale." Wanting to stop Tatiana from caring for him, he stole her diary and read it out loud in front of all the guests, embarrassing her deeply and infuriating her brothers, Gideon and Gabriel, the latter of whom was so angry that he tried to hurt Will and ended up getting his own arm broken in the struggle.
Sins of the Father
Tatiana eventually moved on from Will and married Rupert Blackthorn. Shortly after her honeymoon, during which the couple traveled the continent, sixteen-year-old pregnant Tatiana and her husband returned to London to pay her father, Benedict, a visit. However, they were unaware that Benedict was now in the final stage of his contracted demon pox and had already turned into a demon—specifically a large, demonic worm. The couple was attacked, and, much to Tatiana's horror, Rupert was eaten and promptly killed by her now-demonic father. Tatiana was unable to do anything except scream in terror as the worm took Rupert away. The Shadowhunters of the London Institute arrived shortly after, and Tatiana explained to them the situation. When Tatiana found Rupert's mutilated body, particularly his foot, Tatiana was frozen in terror and was in such shock that she had to be dragged to the carriage and away from the battle by Tessa Gray.
While Tatiana was mourning the death of her husband and father, the Lightwood residences and possessions were confiscated from them by the Clave as part of their investigation. Tatiana, who had been taken in by her late husband Rupert's family, also feared the shame their family would suffer if the truth regarding her parents' deaths was made public. In an effort to cover it up and salvage their reputation, Tatiana lied and claimed that Benedict was murdered by her brothers, Gideon and Gabriel, as well as the others from the London Institute. She made an official complaint to the Council against them, though even Consul Wayland, who was not fond of Charlotte Branwell, the head of the London Institute, did not believe her claims.
Some time after, Tatiana attended the emergency Clave meeting called by Wayland, discussing Charlotte's position as the head of the London Enclave. Tatiana supported his claim, though her begrudging statements were questioned by Inquisitor Whitelaw. To refute her, Whitelaw revealed the true nature of Benedict's death and disease, telling her that, if not for the residents of the London Institute, the Lightwood family would have been stripped of their Marks, left to be mundanes, and had their family name taken off the records. Before Tatiana could respond, the anxious Consul interrupted the Inquisitor. While several automatons disrupted the meeting and attacked the Shadowhunters, Tatiana was among those who survived.
At one point, in an unknown order of events, Tatiana gave birth to her son, Jesse, moved to Idris, got back the Lightwood manor in Chiswick, and adopted Grace Cartwright, raising her as her ward. Her son, Jesse, however, was born so weak and sickly that when it was time for him to receive his first Marks, Tatiana begged them not to do it, to no avail. When he was sixteen, Jesse died, and Tatiana mourned for him and never truly got over his death, even almost a decade after.
Tatiana grew increasingly reclusive, refusing to see even her own brothers, whom she has come to hate. Over the years, Tatiana has turned to dark magic, still hoping to save her son, and she has been faithfully taken care of by Grace. In 1903, she called for Magnus Bane and asked him to perform a ritual that involves the killing of five Shadowhunters, which Magnus deduced she would use to alchemize into magic for a spell; though she offered him an obscene amount of money, Magnus refused.
- Clockwork Prince (first mention)
- Clockwork Princess (first appearance)
- The Midnight Heir
- The Last Hours (set to appear)
- A History of Notable Shadowhunters & Denizens of the Downworld
- Lady Midnight (mentioned only)
- Tatiana was named after a Russian friend of her mother.
- Tatiana will be the/an antagonist in The Last Hours.
- According to a "found" family tree, Tatiana died in 1918 at the age of 55, or 56, and that her son, Jesse, lived and went on to marry Will's daughter, Lucie.
- An error on the same family tree states that Tatiana was born in 1857, making her the eldest Lightwood sibling, when she is in fact the youngest, a fact supported by statements by characters in the series. Apparently also according to Cassandra Clare, Tatiana is in fact a year younger than Will.
- ↑ 1.0 1.1 An answer via Tumblr (referenced based only on good faith and its likeliness)
- ↑ 2.0 2.1 Clockwork Prince
- ↑ A History of Notable Shadowhunters & Denizens of the Downworld
- ↑ Clockwork Princess
- ↑ The Midnight Heir
- ↑ Tatiana in TLH, Cassandra Clare on Twitter
- ↑ TDA/TLH, Cassandra Clare on Tumblr