Russia – Reign

From the history lessons, I well remember 3 names of Russian reigns:
-Ivan the Terrible (also known as Ivan IV Vasilyevich or Ivan the Fearsome)
-Peter the Great (Peter I or Peter Alexeyevich)
-Catherine II (Catherine the Great)

I believe, Peter I was the “greatest”, however all mentioned above changed “Russia” a lot, and made it much larger and stronger country (empire).