After he became emperor, Caligula took on the role of a dutiful son and brother in a public show of "pietas" ("piety"). He went out to the islands of Pontia and Pandateria in order to recover the remains of Agrippina and Nero. It was not easy to recover Nero's bones as they were scattered and buried. Moreover, he had a stormy passage; however, the difficulty in his task made his devotion seem even greater. The ashes were brought to Ostia, from where they were carried up the Tiber and brought to the Campus Martius, from where equestrians placed them on briers to join the ashes of Germanicus in the mausoleum of Augustus. The move was reminiscent of when Agrippina carried the ashes of her husband just over 17 years earlier. Agrippina's funerary urn still survives ().