Flavia Maxima Fausta

Flavia Maxima Fausta Augusta (c. 289 – 326 AD) was a Roman empress. She was the daughter of Maximian and second wife of Constantine the Great, who had her executed and excluded from all official accounts for unknown reasons. Historians Zosimus and Zonaras reported that she was executed for adultery with her stepson, Crispus.

Source: Wikipedia — https://en.wikipedia.org/wiki/Flavia_Maxima_Fausta