Titus Julius Priscus

Roman imperial usurper (died c. 251)

Crisis of the Third Century

Reign of Maximinus Thrax (235–238)

Death of Alexander Severus (235)
Harzhorn (c. 235)
Usurpation of Magnus (c. 235)
Usurpation of Quartinus (235)

Year of the Six Emperors (238)

Revolt of Gordian I & Gordian II (238)
Battle of Carthage (238)
Siege of Aquileia (238)
Reign of Pupienus & Balbinus (238)
Invasion of the Carpi (238–239)

Reign of Gordian III (238–244)

Sabinianus Revolt (240)
Fall of Hatra (241)
Resaena (243)
Misiche (244)

Reign of Philip the Arab (244–249)

Invasion of the Carpi (245–247)
Secular Games of 248 (248)
Usurpation of Sponsianus (240s)
Usurpation of Pacatianus (248)
Usurpation of Jotapianus (249)
Usurpation of Silbannacus (249 or 253)
Decius' Rebellion (249)
Verona and death of Philip & Philip II (249)

Reign of Decius (249–251)

Plague of Cyprian (250–270)
Decian persecution (250–251)
Gothic invasion of Cniva (250–251)
Carpi invasion of Dacia (250)
Nicopolis ad Istrum (250)
Beroe (250)
Philippopolis (250)
Usurpation of Julius Priscus (251)
Abritus and death of Decius and Etruscus (251)

Reign of Trebonianus Gallus (251–253)

Death of Hostilian (251)
Mariades' Revolt (252)
Nisibis (252)
Barbalissos (253)
Interamna Nahars (c 253)

Reign of Aemilianus (253)

Antioch (253)

Reign of Valerian and Gallienus (253–260)

Thessalonica (254)
Thermopylae (254)
Dura-Europos (256)
Gothic invasion (256–257)
Invasion of Shapur (258)
Invasion of the Alemanni (258–260 approx)
Mediolanum (259)
Scythian invasion (259–260)
Edessa (260)

Reign of Gallienus (260–268)

Caesarea (260)
Usurpation of Ingenuus (260)
Usurpation of Regalianus (260)
Usurpation of Macrianus Major (c. 259–261)
Gallic Empire (260–274)
Death of Saloninus (260)
Roxolani Invasion of Pannonia (260)
Campaigns of Odaenathus (260–267)
Usurpation of Quietus (261)
Usurpation of Balista (261)
Usurpation of Valens Thessalonicus (261)
Usurpation of Lucius Calpurnius Piso Frugi (261)
Usurpation of Macrianus Minor (261)
Pannonian Rebellion (261)
Usurpation of Mussius Aemilianus (261–262)
Postumus' Campaign against the Franks (262)
Postumus' Campaign against the Alamanni (263)
Ctesiphon (263)
Scythian Invasion (265–266)
Assassination of Odaenathus (267)
Usurpation of Maeonius (266–267)
Scythian Invasion (267–269)
Heruli Raids (267)
Athens (267)
Usurpation of Acilius Aureolus (268)

Reign of Claudius Gothicus (268–270)

Reign of Aurelian (270–275)

Usurpation of Victorinus Junior (271)
Junthungi Invasion (271)
Domitian II (271)
Tetricus I & Tetricus II (271–274)
Rebellion of Felicissimus (270s)
Placentia (271)
Fano (271)
Pavia (271)
Tyana (272)
Immae (272)
Emesa (272)
Razing of Palmyra (273)
Usurpation of Faustinus (c. 273)
Châlons (274)

Reign of Tacitus (275-276)

Gothic Invasion (276-277)

Reign of Probus (276-282)

Vandal Invasion (276-278)
Sarmatian Invasion (278)
Usurpation of Bonosus & Proculus (280)
Usurpation of Julius Saturninus (280)

Reign of Carus (282-283)

Carus' invasion of the Sasanian Empire (283)

Reign of Carinus (283-285)

Usurpation of Julian of Pannonia (284-285)
Margum (285)

Titus Julius Priscus was a mid-3rd-century Roman usurper.

He was the governor of Thrace, and proclaimed himself Emperor in opposition to Emperor Decius at Philippopolis towards the end of 251, probably with Gothic collusion following their successful siege at the Battle of Philippopolis. The Roman Senate declared him a public enemy almost as soon as he attempted to usurp the throne. Priscus was killed shortly after his proclamation.^[1]