Incest of unequal gravity: the "incestus iuris gentium," which was applied to both Romans and non-Romans in the Empire, and the "incestus iuris civilis," which concerned only Roman citizens. Therefore, for example, an Egyptian could marry an aunt, but a Roman could not. Despite the act of incest being unacceptable within the Roman Empire, Roman Emperor Caligula is rumored to have had sexual relationships with all three of his sisters (Julia Livilla, Drusilla, and Agrippina the Younger). Emperor Claudius, after executing his previous wife, married his brother's daughter Agrippina the Younger, and changed the law to allow an otherwise illegal union.
Agrippina the Younger word of her survival after the boat sank from her freedman Agermus. Panicking, Nero ordered a guard to 'surreptitiously' drop a blade behind Agermus and Nero immediately had him arrested on account of attempted murder. Nero ordered the assassination of Agrippina. He made it look as if Agrippina had committed suicide after her plot to kill Nero had been uncovered. After Agrippina's death, Suetonius says that Nero examined Agrippina's corpse and discussed her good and bad points. It is said that Nero believed Agrippina to haunt him after her death. The tale of Cassius Dio is also somewhat different. It