Klatia

"When our family first settled here, there was a girl named Tatia, she was an exquisite beauty... Every boy of age desired to be her suitor- even though she had a child by another man, but none loved her more than Niklaus."

- Elijah to Stefan and Damon

Klatia is the het ship between Tatia and Klaus Mikaelson from the The Vampire Diaries fandom.

Early History
During the Middle Ages, Tatia, the Original doppelgänger, lived in a small village with her Viking husband and their child. However, he ultimately died in battle, and instead of throwing herself on his funeral pyre as was expected of a Viking widow, she decided to live and move on and tried to find love again. She eventually met Niklaus. Not much is known about their relationship or how it began, but like his brother, Elijah, he fell deeply in love with Tatia. So much so that even Elijah described his love for her, “None loved her more than Niklaus.” In The Vampire Diaries, it was stated that Tatia loved both of the brother's and couldn't choose. While in The Originals, it was revealed she chose Elijah. This caused Klaus to grow estranged from his brother. Their mother, Esther, wanting to end their feud, used Tatia's blood in the spell to turn her children into the Original Vampires after the werewolves killed her son Henrik. Tatia's blood, which possessed mystical properties due to her status as a Petrova doppelgänger, was enchanted by Esther and mixed with the wine that she and Mikael gave their children with dinner. During his first transformation, Klaus completed his transition but shockingly, for some reason he also triggered the werewolf curse. This led Mikael to find out that Esther had been unfaithful and Klaus was not his son. Tatia eventually found out about Klaus being a dark creature and saw him standing amongst the bodies of innocents. Before he could have a chance to explain, she ran away in fear. Elijah caught up to her to try and calm her down, but Tatia tripped and fell, cutting her hand. This caused Elijah to become overwhelmed with the hunger for blood and he fed on Tatia until she died. He returned her body to Esther, knowing Klaus would never forgive him for killing the woman he so deeply loved, he allowed her to erase his memory and take the blame for Tatia's death.

After finding out Klaus wasn't his son, Mikael forced Esther (who used what was left of Tatia's blood) to place a curse on Klaus that would suppress his werewolf side, denying him any connection to his true self.

Years later, thinking his mother was the one that killed Tatia, Klaus never forgave her and grew pure and utter hatred for his mother. Enraged for centuries for what she'd done.

The Vampire Diaries
In a flashback scene back in 1492, Klaus scolded Elijah when he fell for Katerina Petrova as a vampire's greatest weakness was love. Klaus told him that they did not feel, nor did they care, but an emotional Elijah, wanting to save Katerina, reminded him of Tatia, saying, “We did once.” and Klaus made almost a devastated, tearful expression, replying, “..Too many lifetimes ago to matter.”

In Season 3 Episode 13, Klaus and Elijah have dinner with the Salvatore brother's. When Klaus intentionally annoyed Stefan by discussing about Elena, he asked Elijah if they should tell them about Tatia, the originator of the Petrova line. Damon asked Elijah to explain, and Elijah talked about Tatia, saying every man wanted to be her suitor despite the fact that she was a widow with a child from another man. Klaus' expression turned wistful when Elijah added, “But none loved her more than Niklaus.” Klaus then responded saying that “there was one who loved her at least as much”, and Stefan figured out that both of them had fallen for Tatia.

The Originals
In Season 2 Episode Brotherhood Of The Damned, Klaus was visibly furious and hurt when Elijah revealed that he was the one who killed Tatia. He considered Elijah to no longer be the "Noble Stag" and said he was just as depraved as he was. But despite feeling incredibly heartbroken over the truth, Klaus proved to Finn that he was capable of forgiveness and forgave Elijah.

Quotes
"None loved her more than Niklaus."

- Elijah about Tatia "This is where the first woman I ever loved told me she loved me in return. It's also where I laid her body after I took her life. No one knows this, not even Niklaus.. My brother loved Tatia as DEEPLY as I did. He still believes that mother killed her. Not only is this a lie, this is a lie of my creation. And my brother doesn't forgive. He doesn't forget."

- Elijah to Camille

Behind The Scenes
"Klaus and Elijah both were certainly interested and invested in Tatia because they both loved her."

- Joseph Morgan.

"Elijah was actually the one to kill Klaus' (Joseph Morgan's) first love Tatia (Dobrev), the Original doppelganger, all because his thirst for blood became too powerful and he attacked and drained the innocent human."

- EOnline The Originals Interview.

Fanon
Klatia is one of Klaus' most popular rare-pair ships. Some fans who ship Klaroline, Klayley or Klamille often ship Tatia with Klaus as well because of their tragic love story. While Tatia eventually chose Elijah, many preferred him with Katherine (Kalijah) and Klaus with Tatia. Klatia is semi-popular amongst other Klaus ships, but many fans find it sweet and sad that Klaus was happy the most as a human when he was with Tatia. Fans also ship the two because of Joseph Morgan and Nina Dobrev's chemistry. It is Tatia's second most popular ship and Klaus' seventh most popular.

Currently Klatia has 23 works on AO3. It is Tatia's third most written ship and Klaus' seventh most written.

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Trivia

 * Tatia's blood was used by Esther to bound Klaus' werewolf heritage. Something he was deeply disturbed with upon finding out.
 * Tatia is featured on "The Ladies Who Loved Klaus Mikaelson." list.
 * The Vampire Diaries official Twitter account tweeted a picture of Klaus and Tatia for Tatia's first introduction in The Originals.
 * Joseph Morgan and Nina Dobrev are close friends in real life and enjoy working with each other.