Overview
Cornelia was the daughter of Scribonia and her second husband. She was stepdaughter to Octavian (later the Emperor Augustus) through her mother's third marriage and half-sister to Julia the Elder, Augustus' only biological child.
Life
Little is known of Cornelia, almost all of which comes from three primary sources. A passage from Suetonius says that before her marriage to Octavian, Scribonia was twice married to ex-consuls with children from only one of those marriages. An inscription attests to a slave owned by Scribonia and her son Cornelius Marcellinus. Finally, an elegy of Sextus Propertius takes the form of a message addressed to Paullus Aemilius Lepidus from his dead wife Cornelia. John Scheid has drawn from these three sources five definite facts about Cornelia:
Before marrying Octavian, Scribonia had two consular husbands and had children with the second;
Scribonia had a son named Cornelius Marcellinus;
Scribonia had a daughter named Cornelia;
Cornelia died in the year of her brother's consulate;
Cornelia was the wife of Paullus Aemilius Lepidus.
Scheid expands on the last point, noting that Cornelia must have died before her husband had in 13 BC, for Lepidus went on to marry Claudia Marcella; she in turn married Marcus Valerius Messalla Barbatus after the death of her husband.
From Wikipedia (CC BY-SA 4.0).