Aaron Mikaelson (Rising the Dead)

"You wish to accelerate the plan? Fine! Then we shall accelerate."

- Aaron, showing his annoyance at Kol's haste.

Aaron Mikaelson was the eldest son of Esther and Mikael who was born in the Old World and was believed to have died in the Old World from a Plague, the Plague had in fact been Aaron's attempt to replicate Silas's Immortality spell and upon his success he was magically locked away in a coffin by his Mother and Father after an argument which they took with them to the New World, upon fearing the loss of her children Esther would later alter her decision against the Immortality spell but refused to free Aaron as she knew he would be vengeful against her and Mikael.

Trivia

 * Aaron is believed by many to be the name of Esther's first child, as the name appears on the cave wall carvings with the Mikaelson names.
 * Aaron is the first (former) Witch to reveal his family's Witch ancestry, openly revealing to Kol that the Mikaelsons are all blood descendants of Silas and his Lover.