Marcus Peducaeus Plautius Quintillus (died 205) was a Roman noble closely related by birth, adoption, and marriage to the Nerva-Antonine emperors. Through his marriage to Fadilla, the daughter of Emperor Marcus Aurelius and Empress Faustina the Younger, he became the brother-in-law to the future emperor, Commodus.[1] Despite his position, he never became emperor himself. After Commodus was assassinated in 192, he fell out of favor with Septimus Severus during the Year of the Five Emperors. In 205, he killed himself after Septimus issued an order for his execution.