Agrippina the Younger outraged by Claudius' adoption of Nero and his choice of Nero as successor, instead of choosing his own son Britannicus. Nero and Octavia were married on June 9, 53. Claudius later repented of marrying Agrippina and adopting Nero, began to favor Britannicus, and started preparing him for the throne. His actions allegedly gave Agrippina a motive to eliminate Claudius. The ancient sources say she poisoned Claudius on October 13, 54 with a plate of deadly mushrooms at a banquet, thus enabling Nero to quickly take the throne as emperor. Accounts vary wildly with regard to this private incident and according
Agrippina the Elder Sejanus had the priests and magistrates add prayers for the health of Nero and Drusus in addition to those normally offered to the emperor on that day. Tiberius was not happy with this and he voiced his displeasure in the Senate. In addition, he questioned the priests of the Palatine. Some of the priests who offered the prayers were relatives of Agrippina and Germanicus. This made Tiberius suspicious of her and marked a change in his attitude toward her and her older sons, but not Caligula. In AD 25, Sejanus requested Livilla's hand in marriage. Livilla was a niece of