Klaus was an original vampire he was turned turned along with his brothers and his sister Finn, Elijah, Klaus , Kol and Rebekah. Their parents made them drink the blood of Tatia, one of Amara's doppelgangers, before having Mikael (there father) kill them. When they woke, their father forced them to drink human blood. Before that they were just regular kids In 1001 AD, after werewolves killed her youngest son, Henrik, (their mother a powerful witch) Esther performed a powerful ritual in order to protect her five remaining children. After they noticed changes their emotions were heightened and they had the ability to compel but the biggest downfall for any vampire is the blood lust the vervain that protects people from being compeled and a white oak stake (the only stake that can kill a Original vampire).
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The devil in New Orleans
Lupi mannariwelcome to New Orleans where your King Klaus Mikealson makes you coward in fear where his thirst for blood is extreme