Marcus Ummidius Quadratus Annianus

Marcus Ummidius Quadratus Annianus (138 CE - 182 CE) was a Roman Senator and the nephew of the Roman emperor Marcus Aurelius. He was involved in an unsuccessful plot to assassinate his cousin the Emperor Commodus, which led to his execution afterwards.

Offices Quadratus Annianus held included legate to the proconsul of Africa (Roman province), and consul ordinarius in 167 with the emperor Lucius Aurelius Verus.

Quadratus Annianus was the son of Marcus Aurelius’ sister, Annia Cornificia Faustina and a Roman Senator. Ronald Syme identifies him with one of the suffect consuls in 146, recorded in the Fasti Ostienses as Gaius Annianus Verus, but having the full name of Gaius Ummidius Quadratus Annianus Verus. He was descended from one of the leading aristocratic and political influential families in Rome and was a direct descendant of the late suffect consul Gaius Ummidius Durmius Quadratus, one time suffect consul. Through his mother, Quadratus Annianus was a member and a relative to the ruling Nerva–Antonine dynasty of the Roman Empire. His sister was Ummidia Cornificia Faustina.

His mother had died sometime between 152 and 158. At her death, Quadratus Annianus and Cornificia Faustina divided their mother’s property making them both very wealthy. After his mother’s death, Quadratus assumed a mistress and lover, a Greek Freedwoman called Marcia. Marcia later became a mistress to the Roman emperor Commodus.

Following his consulship, Quadratus adopted the first son of the Ponian Greek Roman Senator and philosopher Gnaeus Claudius Severus, and the adopted man assumed the name Marcus Claudius Ummidius Quadratus. The reason why Quadratus adopted Gnaeus Claudius Severus’ first son is unknown.

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