Who divided the Roman Empire for the last time?

Related questions

1. Who controlled the Byzantine church?
2. What is Byzantine gold?
3. What does the term Byzantine mean today?
4. What is a Byzantine bracelet?
5. Why does Byzantine mean complex?
6. Which country is byzantine?
7. What is asynchronous BFT?
8. What is purple dye made of?
9. What is a byzantine plot?
10. What is Crash fault tolerance?

Tags

1. #years
2. #emperor
3. #diocletian
4. #empire
5. #roman
6. #three
7. #eastern
8. #western
9. #manage
10. #would
11. #hundred
12. #parts
13. #reunited
14. #again
15. #divided
16. #split
17. #decided