6. Dedication to the deified Augusta (Livia), circa AD 50 54, from the Porticus at Herculaneum. W. 67cm. 7. A 50cm section of the Marble Plan of Rome, circa AD 203 11, showing a plan of the now lost Porticus of Livia. Dedicated in 7 BC, it was a complex containing a temple, colonnades, a library and schools. 8. Detail of a marble panel from the north processional frieze of the Ara Pacis in Rome, commissioned in 13 BC and dedicated in 9 BC. It shows Agrippa (left) and probably Julia (right). Beween them is their son Gaius, the grandson of Augustus. H. circa 1.6m.

Roman women: following the female line

Guy de la Bédoyère tracks the Roman women who were held in high esteem because they exemplified the virtues of the state and thereby ensured the succession of the Julio-Claudian dynasty.

Detail from marble relief created during the reign of Claudius, AD 41–54, found in Ravenna. It shows the Julio-Claudian dynasty in which Livia played a central role. From left to right: Nero Claudius Drusus, Germanicus, Livia as Venus, with Eros on her shoulder, and the deified Augustus as Mars. H. 104cm. Photograph: John Pollini.

The Romans had a very clear idea about what a good woman should be. First of all, she should aspire to unimpeachable Pudicitia, the fragile personification of purity – the slightest questioning of a woman’s virtue could destroy her – and she was expected to be fertile, loyal and supportive, both as a mother and a wife. But women were also believed to be especially susceptible to the ‘effeminate’ temptations of luxury and indulgence, failings that were seen as potentially undermining of the state.

Life-sized marble bust of Livia, circa 25–1 BC, found in Italy. H. 28cm.

When Octavian seized control of the Roman world in 31 BC and took the name Augustus just four years later, he knew he had to reinvent the whole image of the Roman state. He famously claimed to have restored the Republic, and in a sense he had, but he had also established a monarchy in all but name – where none was supposed to exist. However, he was constantly thwarted in his attempts to make the emperor’s position hereditary.

The Julio-Claudian dynasty (1), of which Augustus was the first of five emperors, lasted from 27 BC to AD 68, and the only reason it endured was because it was handed down through the female line.