Lord Harkon is a Nord vampire lord and the leader of the Volkihar vampire clan. He is the father of Serana and has an estranged wife named Valerica.
Before becoming a vampire, Harkon was a very rich ruler of the lands, but feared mortality. Harkon claims that he sacrificed a thousand innocents in Molag Bal's name before making a pact with Molag Bal to become a vampire lord along with his family. Lord Harkon becomes abscessed with a prophecy to block out the sun and is willing to sacrifice his daughter in order to do so seeing it as a benefit to all vampire kind.