Original Vampire is a term used to describe a progenitor in a vampire bloodline. The term was initially introduced when Rose revealed to Elena, Stefan and Damon their existence, and primarily refers to the Mikaelson Family, but has since expanded after Esther used a spell to turn Alaric into a vampire and Elena referred to him as an "Original". A number of characteristics differentiate an Original from the vampire bloodlines that they beget, but the fundamental difference is that Originals become vampires through a spell, not by ingesting the blood of another immortal.
Known Original Vampires
7. Megan undead