Eugene Lionheart is the titular protagonist of the web novel Damn Reincarnation. In his previous life, he was known as Hamel Dynas, and was one of the Five Great Heroes who vanquished three of the five Demon Kings of the Devildom of Helmuth long ago. After dying in the castle of the Demon King of Incarceration, he found himself reborn 300 years later as a distant relative of his comrade, Vermouth Lionheart. Reborn into a collateral branch family of the Lionheart Family, the son of Gerhard Lionheart, he swore to finish the task his comrades could not: Kill all the Demon Kings.

When the warrior Hamel sacrifices himself to protect his rival Bermut Lionhart, he makes Bermut vow to vanquish the last of the demon kings. Reincarnated with his memories 300 years later, he is shocked to find that not only are the demon kings still alive, but that he has been reborn as Eugene Lionhart, a member of his former rival’s bloodline! Now, as Eugene comes of age, he must train to prove himself as a Lionhart and eliminate the remaining demon kings once and for all. 
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(Source: Tapas)