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.
Roman Emperors during the Fall of the Western Empire Zeno was temporarily displaced in Constantinople by Verina's brother ("i.e.", Leo I's brother-in-law and Leo II's great uncle-in-law) "Basiliscus", but regained his position as emperor a year later. On his death, Ariadne married the court functionary "Anastasius I", and thereby elevated him to Emperor by virtue of marrying the Empress. Roman Emperors during the Fall of the Western Empire The office of Roman Emperor underwent significant turbulence in the fourth and fifth centuries, particularly under the period of the Dominate. In the West, where the fall of the Western Roman Empire was underway, its holders became puppets of a succession