Julia Livilla Agrippina) to overthrow Caligula and to replace him by his brother-in-law Marcus Aemilius Lepidus (Drusilla's widower, but also lover of Agrippina and Livilla). Livilla and her sister Agrippina the Younger were banished to the Pontine Islands (they were most likely separated in their exile and each one sent to a different island). After the deaths of Caligula, his fourth wife Milonia Caesonia, and their daughter Julia Drusilla, she returned from exile on the orders of the new emperor, Livilla's paternal uncle Claudius. Later in 41, she fell out of favour with Messalina (Claudius's third wife) and was charged by her
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