Agrippina the Younger attained a level of power in first-century Rome unprecedented for a woman. In this first biography of Agrippina in English, Anthony A. Barrett draws on the latest archaeological, numismatic, and historical evidence to create a startling new picture of this influential and misjudged woman. According to ancient sources, she achieved her success by plotting against her brother, the emperor Caligula, murdering her husband, the emperor Claudius, and controlling her son, the emperor Nero, by sleeping with him. Although she was ambitious, Barrett argues that she made her way through ability and determination rather than by sexual allure, and that her political contributions to her time seem to have been positive.