| skos:altLabel | - Tetrarch
- tetrarch
- tetrarchy
- co-emperor
- Roman Empire
- junior emperor
- co-emperors
- Tetrarchs
- four emperors that governed the empire in the year 300
- Diocletian's co-emperors
- Division of the empire
- First division of the Roman Empire
- Quadrumvirate
- Tetrarchic
- Tetrarchies
- Tetrarchy#Confusion and Collapse
- Tetrarchy#Demise
- Tetrarchy#Tetrarchy until 1 May 305
- Tetrarchy#Tetrarchy_until_16_May_307
- Tetrarchy#Tetrarchy_until_July_306
- multiple emperors simultaneously
- overseen by all four
- reorganization of the Roman Empire in 375
- restructuring of the empire
- tetrarchal
- tetrarchic
- tetrarchic system
- tetrarchies
- tetrarchs
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