The death of Agrippina came soon after that of her son. There are more majestas trials, trouble with the Parthians, and, despite the assurance from his favourite astrologer that he had many years left, Tiberius addresses his own mortality. With Drusus dead, the only remaining heirs to the throne were Gemellus, son of Drusus, and Gaius, son of Germanicus – aka Caligula.