Quintillus was Roman emperor for seventeen days in September 270. Quintillus was the brother of Claudius Gothicus, who was Roman emperor until September 270. Quintillus took power in the Italian Peninsula when Claudius Gothicus died at Sirmium (Sremska Mitrovica, Serbia). After a short time, Aurelian's army overcame Quintillus's army in a battle at Aquileia in the later part of September. Quintillus then died, either by suicide or by murder by soldiers.