I want to know the answer to the following question:
When did Basil I's rule begin?
All the background I'm provided with is that "In Eastern Europe, Byzantium revived its fortunes under Emperor Basil I (r. 867–886) and his successors Leo VI (r. 886–912) and Constantine VII (r. 913–959), members of the Macedonian dynasty.". Is that enough to answer the question?
Answer: yes