294 Consul (with Constantius Chlorus); Diocletian defeats the Sarmatians; Galerius' campaign to Upper-Egypt; he accepts the title Sarmaticus Maximus and perhaps also the titles Aegyptiacus Maximus and Thebaicus Maximus
295 War against the Persians (?); accepts the title Persicus Maximus
296 The Persian king Narseh occupies Armenia; Diocletian fights against the Carpi; Galerius accepts the title Carpicus Maximus and adds Britannicus Maximus after Constantius has reconquered Britain
297 Consul II (with Maximianus V); Galerius defeated by the Persians in Mesopotamia
298 Galerius assembles an army at Satala and defeats Narseh as Osxay; treaty of Nisibis (Rome gains territory east of the Tigris); Galerius accepts the titles Armeniacus Maximus, Medicus Maximus, Adiabenicus Maximus, and Persicus Maximus II; Tiridates III made king of Armenia.
299 Beginning of a protracted war along the Danube against the Sarmatians and Carpi
300 Consul III (with Constantius Chlorus III); accepts the title Sarmaticus Maximus II
301 Monetary reform; edict on Maximum Prizes;Constantius fights against the Germanic tribes, Galerius against the Carpi; both accept the titles Germanicus Maximus II and Carpicus Maximus II
302 Consul IV (with Constantius Chlorus IV); Monetary reform; accepts the titles Germanicus Maximus III, Sarmaticus Maximus III and Carpicus Maximus III
303 In the Sasanian Empire, Narseh dies and is succeeded by Hormizd II; edict against the Christians; Galerius accepts the titles Germanicus Maximus IV and Carpicus Maximus IV
The bath of Serdica, where Galerius spent his final days
304 End of the war in the Rhineland and along the Danube; the two caesares accept the titles Germanicus Maximus V and Carpicus Maximus V
305 Consul V (with Constantius Chlorus V); Diocletian and Maximianus resign; Second Tetrarchy: they are succeeded by Galerius and Constantius I Chlorus, who appoint as caesares Maximinus Daia and Severus II; Galerius accepts the title Britannicus Maximus II
306 Consul VI (with Constantius Chlorus VI); death of Constantius, who is succeeded as augustus by Severus II and as caesar by Constantine; in Italy, Maxentius occupies Rome; Galerius recognizes Constantine (Third Tetrarchy); tax edict
306/307 Galerius defeats the Sarmatians, accepts the title Sarmaticus Maximus IV
307 Galerius in Italy; he refuses to recognize Maxentius; accepts the title Germanicus Maximus VI after a victory by Constantine
308 Consul VII (with Diocletian X); war along the Danube; accepts the titles Germanicus Maximus VII and Carpicus Maximus VI; conference of Carnuntum; Licinius made emperor in the west
310 accepts the titles Sarmaticus Maximus V and Persicus Maximus III; in the Sasanian empire, Hormizd II dies and is succeeded by the young Shapur II
311 Consul VIII (with Maximinus Daia); visits Serdica; the anti-Christian edict revoked; death
Contemporary events:
301 Gregory the Illuminator converts the Armenians
305 Death of Porphyry
Buildings:Thessaloniki: Arch and Palace of Galerius
