I want to know the answer to the following question:
When did the Median tribes unify under a single ruler to form the Median Empire?
All the background I'm provided with is that "The unification of the Median tribes under a single ruler in 728 BC led to the foundation of the Median Empire which, by 612 BC, controlled the whole Iran and the eastern Anatolia.". Is that enough to answer the question?
Answer: yes