Nero Claudius Drusus Germanicus, commonly known as Drusus, was the brother of Tiberius, who would become the second Roman emperor. He was a successful general, campaigning against the Gauls during the reign of Augustus in Germany, from which he posthumously received the title Germanicus. He was also very popular with the legions, who erected a monument to him in modern-day Mainz, known in German as the Drususstein. He died after falling off his horse in 9 BCE, and was buried in the Mausoleum of Augustus. This coin was issued in commemoration of his victories over the Germans, which explains the militaristic legend and imagery on the reverse. Many scholars believe that Tiberius and Drusus were likely intended to be co-emperors, based both on Drusus’ popularity and his and Tiberius’ famously close relationship – Tiberius often joined his brother on campaign in the North, and was present for Drusus’ death. Had Drusus survived to become co-emperor, the Roman Empire may have taken a very different trajectory. Solomon Klein 2011.