I want to know the answer to the following question:
Nader Shah expanded Iranian power to its highest peak since what Empire?
All the background I'm provided with is that "During the reign of Nader Shah, Iran reached its greatest extent since the Sassanid Empire, reestablishing the Iranian hegemony all over the Caucasus, as well as other major parts of the west and central Asia, and briefly possessing what was arguably the most powerful empire at the time.". Is that enough to answer the question?