Mikaelson Family Bloodline.

Prologue.

The Mikaelson Family (Elder Futhark: ᛗᛁᚲᚨᛖᛚᛋᛟᚾ) is a powerful family whose line dates back at least to the then Kingdom of Norway in the late 10th century with Mikael and Esther, a wealthy landowner and a Viking warrior, and a housewife and a witch, respectively. At the beginning of the 11th century, the family was mortal until the loss of Esther and Mikael's youngest child, Henrik to a werewolf attack spurred them to use Esther's magic to turn Mikael and the rest of their living children into the world's first vampires, from whom all Vampires are descended. The Original vampires are known as the most powerful supernatural beings in the world, but the Mikaelson family is also known for having members who are witches and Hybrids as well.

FAMILY MEMBERS: 

Mikael †

Esther Mikaelson †

Freya Mikaelson

Finn Mikaelson †

Elijah Mikaelson

Niklaus Mikaelson

Kol Mikaelson

Rebekah Mikaelson

Henrik Mikaelson †

Freya Mikaelson's Son †

Hope Mikaelson

Nik Mikaelson/or Malraux (Freya's son) 

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Trivia;

Rebekah, Kol and Finn Mikaelson are the only Original Vampires to possess witches of New Orleans, out of all the Mikaelson family.

The members of the Mikaelson family all have either I or K in their name except Esther, Hope and Freya.

Mikael, Niklaus and Henrik all have I and K, the two oldest Original siblings Elijah and Finn both have I, and the two youngest Original siblings Kol and Rebekah both have K.

Coincidentally, all members of the Original family have a part to play in the making or the creation of vampires and vampirism.

If all of the Original vampires were to die, every vampire sired from their bloodline will die as well, effectively eradicating the vampire species.

The coffins that the Mikaelsons lie in when daggered/dead are scribed with a metal 'M' to represent Mikaelson.

Klaus, Davos, Celine, Solomon, Benevenuto, Alexander, Chihiro, Gunnar, Milimo, and Pachacuti are The Old Ones from the book series, though, on the TV series Mikael, Finn, Elijah, Klaus, Kol and Rebekah are known as the Originals.

Freya named her son after her beloved little brother, Klaus (info via Riley's tv guide interview)

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"It has been said that all love begins and ends with she who gave us life. A thousand years ago, my mother turned us into monsters, yet still she claimed to love us even as she vowed to destroy us. The noble Elijah, tormented by long buried shameful secrets. Kol, the wily troublemaker out for no one but himself. Finn, the devoted acolyte, his love all too easily warped by our mother's sick hate. Fierce Rebekah, willing to risk everything on the chance that she might one day find happiness. And me, the bastard child, my mother's greatest shame. Now finally we have defeated her, giving her the choice she never thought to give us: to live on as one of the monsters she created, or suffer an agonizing death she so deserves.. "

- Niklaus Mikaelson