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.
Vipsania Agrippina and lived an unhappy long life. Pomponia married Aulus Plautius. Plautius was a general in the conquest of Britain, which he received as a military ovation. Nero murdered their son, reportedly because Agrippina the Younger, mother of Nero, was in love with him and encouraged him to bid for the throne. Another descendant or otherwise relative, Gaius Asinius Lepidus Praetextatus (210 – after 242), became a Consul in 242, being the son of Gaius Asinius Lepidus, Suffect Consul of Rome in 222 and wife (Vettia) (born 190 or 195). Tacitus states that Vipsania was the only one of Agrippa's children