Aulus Ducenius Geminus

Aulus Ducenius Geminus was a Roman senator active in the first century AD. Geminus is best known as Galba's appointment as Urban prefect of Rome during the Year of Four Emperors.

Geminus had family connections with Patavium; he is one of three consular Ducenii that Ronald Syme identifies as a native of that town. The other two are Gaius Decuenius Proculus, consul in 87, and Publius Ducenius Verus, consul in 96.

Most of Geminus' career is known from an acephalic inscription (one where the name of the subject is missing) recovered from Epidaurus in Greece;Werner Eck has argued that the subject of this inscription is Geminus. The earliest office found on this inscription is that of quaestor, assigned to the province of Crete and Cyrenaica; the office of quaestor would have qualified Geminus for admission to the Roman Senate. Next is the traditional republican magistracy of plebeian tribune, after which there is a gap in the inscription. It can be assumed he was praetor, since Geminus had acceded to suffect consul.

The date of his consulate is variously given. The older authorities follow Edmund Groag's argument that Geminus was suffect consul in AD 54 or 55. However, Eck has more recently shown that a nundinium in either year 60 or 61 is more likely. Syme endorses the years 60 or 61, and builds on it the hypothesis that Geminus may owe his appointment to the consulate to Lucius Vitellius, one of Nero's comites, just as had Titus Clodius Eprius Marcellus and Lucius Junius Quintus Vibius Crispus. Nevertheless, either date would fit the next known office: in the year 62 the emperor Nero appointed Geminus, along with Lucius Calpurnius Piso and Aulus Pompeius Paulinus, to a commission to manage the public revenues. According to the inscription from Epidurus, after holding the consulate Geminus was also a member of the quindecimviri sacris faciundis and the sodales Augustales. Following this, Geminus was governor of Dalmatia, and commissioned to lead a military expedition into Illyria; Syme dates his governorship prior to the year 69.

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