included in the list of thirty tyrants enumerated by Trebellius Pollio [see AUREOLUS], was one of the two sons of that Marianus who assumed the purple after the capture of Valerian. Having been associated with his father and brother in the empire, he was entrusted with the government of the East when they marched upon Italy. Upon receiving intelligence of their defeat and death, he took refuge in Emesa where he was besieged, captured and slain by Odenathus in A. D. 262 (Trebell. Poll. Trig. Tyrann.). He is called Quintus by Zonaras (12.24).
[W.R]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890