Valeria Messalina (Latin: [waˈlɛria mɛssaːˈliːna]; c. 17/20–48) was the third wife of Roman emperor Claudius. She was a paternal cousin of Emperor Nero, a second cousin of Emperor Caligula, and a great-grandniece of Emperor Augustus. A powerful and influential woman with a reputation for promiscuity, she allegedly conspired against her husband and was executed on the discovery of the plot. Her notorious reputation probably resulted from political bias, but works of art and literature have perpetuated it into modern times.
Messalina was the daughter of Domitia Lepida and her first cousin Marcus Valerius Messalla Barbatus. Her mother was the youngest child of the consul Lucius Domitius Ahenobarbus and Antonia Major. Her mother's brother, Gnaeus Domitius Ahenobarbus, had been the first husband of the future Empress Agrippina the Younger and the biological father of the future Emperor Nero, making Nero Messalina's first cousin despite a seventeen-year age difference. Messalina's grandmothers Claudia Marcella the Younger and Antonia the Elder were half sisters. Claudia Marcella Minor, Messalina's paternal grandmother, was the daughter of Augustus' sister Octavia the Younger. Antonia Major, Messalina's maternal grandmother, was the elder daughter of Octavia by her marriage to Mark Antony, and was Claudius' maternal aunt. There was, therefore, a large amount of inbreeding in the family.
Little is known about Messalina's life prior to her marriage in 38 to Claudius, her first cousin once removed, who was then about 47 years old. Two children were born as a result of their union: a daughter Claudia Octavia (born 39 or 40), a future empress, stepsister and first wife to the emperor Nero; and a son, Britannicus. When the Emperor Caligula was murdered in 41, the Praetorian Guard proclaimed Claudius the new emperor and Messalina became empress.

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