How did Nero begin his reign and how did his actions change after he turned 20 years old?

His father died when he was very young and his mother was banished, putting him in the care of his aunt. The reigning king at the time was killed and Claudius became emperor. Claudius unbanished Nero's mother and married her. This caused Nero to be the heir to the throne. Claudius died soon, with the cause of death unknown. Nero is crowned king at 17. Starting off, he was a good emperor, but he became more cruel, killing close people and started to act crazy. He no longer tried to do good for the country.

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