AELIVS Information by Tanaquil Sergius The Gens Aelia was a plebeian clan of some prominence during the Middle Republic. In the imperial era, some Aelii gained outstanding fame, because of the level of power they reached. Examples are Lucius Aelius Seianus, who was the commander of the Praetorian Guard during the reign of Tiberius Caesar, P. Aelius Hadrianus Caesar, the adopted son and successor of Traianus Caesar and L. Aelius Verus, a coregent of the emperor Marcus Aurelius.   The emperors P. Aelius Hadrianus and L.Aelius Verus.