Final answer:
Nero, the Roman Emperor, was controlled by his mother and Seneca, but his brutality was seen by many, including the elite Romans and the early Christian movement.
Step-by-step explanation:
Nero, the Roman Emperor, was controlled by his mother, Agrippina, and his advisor, Seneca. However, his brutality was witnessed by many, including the elite Romans and the early Christian movement, whom he persecuted relentlessly. Nero's terrible reputation also stemmed from his actions of ordering the execution of rivals and former advisors due to jealousy, as well as his indulgence in artistic pursuits, which were scandalous to Roman elites.