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