Cyriades

thumb|Imaginary portrait of Cyriades from Promptuarium Iconum Insigniorum|Promptuarii Iconum Insigniorum (1553) Cyriades (referred to in other sources as Mareades or Mariades or Mariadnes) was a Roman rebel who betrayed the city of Antioch to the Sasanian King Shapur I sometime during the 250s. His chief claim to fame is that he is enumerated as one of the Thirty Tyrants who supposedly tried to overthrow the emperor Gallienus.

==The Historia Augusta== Cyriades is listed first in the catalogue of usurpers that comprise the chapter on the Thirty Tyrants within the notoriously unreliable Historia Augusta (and writing under the fictitious name of Trebellius Pollio), whose narrative is brief, indistinct, and largely inaccurate. According to this source, Cyriades was the son of a rich man, also named Cyriades, and whose debauched lifestyle offended his father. After stealing from his father, he fled to the Persians, stimulated Shapur I to invade the eastern Roman provinces and helped in the capture of Antioch and Caesarea. At this point he assumed the purple together with the title of Augustus, possibly killing his father before being slain by his own followers after a short, cruel and crime-filled reign.