Tacitus says Tiberius had Spain's richest man thrown from the Tarpeian Rock and kept his gold and copper mines for himself

Sextus Marius owned gold and copper mines in Spain under the emperor Tiberius. Tacitus calls him the richest man in Spain. He survived an accusation in AD 25. In AD 33 he was charged with incest with his daughter and thrown from the Tarpeian Rock in Rome. Tacitus writes that his gold and copper mines were forfeited to the state, but Tiberius set them aside for himself. He presents this as proof that Marius's wealth, not the charge, killed him. Cassius Dio, writing about two centuries later, gives another account. He says Marius was Tiberius's friend and owed his wealth to imperial favour. Marius had once razed a neighbour's villa and rebuilt it larger to show his power. Dio says Marius sent his beautiful daughter away to keep her from Tiberius, and was then accused of sleeping with her himself. Father and daughter both died. In the same chapter Tacitus records that Tiberius then ordered every prisoner held for complicity with Sejanus to be killed. Their relatives were forbidden to mourn, and the bodies were dragged to the Tiber. The mines Marius owned are not identified today^†.