Athenais (daughter of Herodes Atticus) and the wealthy heiress Vibullia Alcia Agrippina, while her maternal grandparents were the Roman Senator, Consul Appius Annius Trebonius Gallus and the aristocratic woman Atilia Caucidia Tertulla. Her paternal uncle was Tiberius Claudius Atticus Herodianus, while her paternal aunt was Claudia Tisamenis. The maternal uncle of Athenais was Appius Annius Atilius Bradua who served as an ordinary consul in 160. Through her maternal grandfather, Athenais was a relative to the Roman Empress Faustina the Elder, wife of the Roman Emperor Antoninus Pius. Faustina the Elder was the mother of Roman Empress Faustina the Younger and aunt of Roman Emperor Marcus
Agrippina the Younger cousin, Drusilla's widower Marcus Aemilius Lepidus, were involved in a failed plot to murder Caligula, a plot known as the "Plot of the Three Daggers", which was to make Lepidus the new emperor. Lepidus, Agrippina and Livilla were accused of being lovers. Not much is known concerning this plot and the reasons behind it. At the trial of Lepidus, Caligula felt no compunction about denouncing them as adulteresses, producing handwritten letters discussing how they were going to kill him. Lepidus was executed. Agrippina and Livilla were exiled by their brother to the Pontine Islands. Caligula sold their furniture, jewellery, slaves