Julia Agrippina (6 November AD 15 – 23 March AD 59), also referred to as Agrippina the Younger, was Roman empress from 49 to 54 AD, the fourth wife and niece of Emperor Claudius. Agrippina was one of the most prominent women in the Julio-Claudian dynasty. She was the daughter of the Roman general Germanicus and Agrippina the Elder, granddaughter of Augustus (the first Roman emperor). Her father, Germanicus, was the nephew and heir apparent of the second emperor, Tiberius. Agrippina's brother Caligula became emperor in 37 AD. After Caligula was assassinated in 41 AD, Germanicus' brother Claudius took the throne. Agrippina married Claudius in 49 AD.