Emperor Nero
Wikipedia
A Guide to the Trials of Apollo series by Rick Riordan
Emperor Nero is a legacy of Apollo, and the main antagonist of The Hidden Oracle. The last in the Julio-Claudian dynasty, Nero is infamous for his tyranny and overindulgence in wealth and luxury with little regard to his subjects. He is the deified Roman Emperor, who has survived through the millennia along with two other deified Roman emperors-the Triumvirate.
He forms an alliance with Python, who holds Delphi, while he himself controls the other oracles and plans to destroy Dodona. As the Emperor of the East, Nero lives in New York City, where he recruits and trains homeless demigods, and controls the eastern third of North America. He and the other two Roman Emperors have established Triumvirate Holdings.
As "the Beast", Nero killed Meg's father, but later adopted and trained her in demigod arts so she could eventually lure Apollo into the Grove of Dodona. After Rhea restores the Grove of Dodona at Camp Half-Blood, Nero tries to force Apollo and Meg to burn the trees; failing at that, he sends a giant statue of himself, the Colossus Neronis, which originally stood in Rome, against Camp Half-Blood and Apollo and the Greek demigods defend the camp against it. He is killed by Apollo in The Tower of Nero and his power is absorbed by Python.
He forms an alliance with Python, who holds Delphi, while he himself controls the other oracles and plans to destroy Dodona. As the Emperor of the East, Nero lives in New York City, where he recruits and trains homeless demigods, and controls the eastern third of North America. He and the other two Roman Emperors have established Triumvirate Holdings.
As "the Beast", Nero killed Meg's father, but later adopted and trained her in demigod arts so she could eventually lure Apollo into the Grove of Dodona. After Rhea restores the Grove of Dodona at Camp Half-Blood, Nero tries to force Apollo and Meg to burn the trees; failing at that, he sends a giant statue of himself, the Colossus Neronis, which originally stood in Rome, against Camp Half-Blood and Apollo and the Greek demigods defend the camp against it. He is killed by Apollo in The Tower of Nero and his power is absorbed by Python.