Agrippina the Younger and stepfather in 50. Lucius' name was changed to "Nero Claudius Caesar Drusus Germanicus" and he became Claudius's adopted son, heir and recognised successor. Agrippina and Claudius betrothed Nero to Octavia, and Agrippina arranged to have Seneca the Younger return from exile to tutor the future emperor. Claudius chose to adopt Nero because of his Julian and Claudian lineage. Agrippina deprived Britannicus of his heritage and further isolated him from his father and succession for the throne in every way possible. For instance, in 51, Agrippina ordered the execution of Britannicus' tutor Sosibius because he had confronted her and was
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