Why did Agrippina lose influence over Nero after he became emperor?

Agrippina the Younger initially exerted significant influence over Nero during the early years of his reign, attempting to act as regent following the death of Claudius in 54 CE. However, her power waned as Nero began to assert his independence and take charge of the government.1

Several factors contributed to her loss of influence:

• Independent Advisers: Nero’s tutors and chief advisers, Seneca and the praetorian prefect Sextus Afranius Burrus, were unwilling to remain tools of Agrippina. They actively encouraged Nero to act independently of his mother, leading to a growing coolness in their relationship.23
• Political Marginalization: By 56 CE, Agrippina was forced into retirement, leaving Seneca and Burrus as the effective rulers of the empire.3
• Personal Conflict: The final rupture in their relationship occurred due to Agrippina’s opposition to Nero’s affair with Poppaea Sabina. This conflict ultimately led Nero to order her murder in 59 CE.1