Klaus' Father was a werewolf whom Esther had an affair with, which Klaus was the outcome. His name and history are unknown, for now.

Season TwoEdit

He was first mentioned by Elijah in the episode Klaus. He told Elena about the true nature of Klaus. Klaus is from another bloodline apart from the originals. After Mikael found out that Esther had an affair with this man, he killed him and his entire family, which started the war between vampires and werewolves continuing to this day.

Season ThreeEdit

In Ordinary People, Elena and Rebekah discuss the origins of the vampires. Mikael confirms that he was the one who murdered Klaus's biological (werewolf) father, his family and half the village when he learned of Esther's affair.

TriviaEdit

• He is the oldest of the werewolves mentioned in the TV Series.
• According to Elijah and Rebekah, he and his family were killed by Mikael.
• He and his family's death is the reason why vampires and werewolves are at war with each other.
• Elijah's story and Rebekah's story about Niklaus' Father seem to contradict each other.
• Elijah said that Mikael killed Klaus' father after finding out that Klaus wasn't his son, while not realizing that Klaus' father was a werewolf and he was starting a new war between species.
• Rebekah said that Mikael learned that Klaus wasn't his son after Klaus triggered his werewolf gene. This means that Mikael was aware that Klaus' father was a werewolf.

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