The Empire Stabilizes:  The Tetrachy

(system with 2 Augusti and 2 Caesari designed by Diocletian)
 

Diocletianus (284-305 AD)


 

Maximianus I Herculis (286-310 AD) Augustus


 

Domitius Domitianus (296-297 AD), Usurpator

Galerius Caesar and later Augustus (305-311 AD)

Constantius I, Caesar, and later Augustus (305-306 AD)

 

Maximinus II Daja (309-313 AD)

 
 

Severus II (306-307 AD)


 

Maxentius (306-312 AD)

 

Romulus, son of Maxentius (died 309 AD)

 
 

Alexander of Carthage (311 AD)

 

Valens (316-317)

 

Licinius I (308-324 AD)

 
 

Licinius II ( 317-324 AD)

Martinianus (324 AD)

 

To the Dynasty of Constantine the Great