Olivier

Olivier is the first vampire sired by the resurrected Kol Mikaelson, turned sometime in between 2x22 AU and 3x01 AU, and as such is the first vampire of Kol's resurrected bloodline.

Role in The Originals Alternate Season Three
He contacts Kol at the end of 3x01 to let him know that he spotted the hunter, Jeremy Gilbert, in Los Angeles.