roman throne

4th century abdication augustus caesar co-emperor constantius chloride

accession ancient rome carinus carus diocletian east roman empire

3rd century accession ancient rome carus crisis eastern campaigns

3rd century accession claudius ii crisis emperor emperor election

accession ancient history ancient rome co-emperors crisis of the third century gallienus

2nd century ancient rome antoninus pius border security emperors hadrian

ancient rome antoninus pius emperor hadrian imperial succession principate