I want to know the answer to the following question:
In what year did Diocletian begin his reign?
All the background I'm provided with is that "The Emperor Diocletian (r. 284–305) split the empire into separately administered eastern and western halves in 286; the empire was not considered divided by its inhabitants or rulers, as legal and administrative promulgations in one division were considered valid in the other.[C]". Is that enough to answer the question?
Answer: yes