Peter the Great, full name Peter Alexeyevich, was the Emperor of Russia, ruling from 1682 to 1725. He is known for his reforms and military expansions that transformed Russia into a European power. During his reign, Peter the Great implemented a series of reforms, including military, educational, and administrative systems, and led Russia to significant military victories, ultimately making it a major European power. His reign is marked by Westernization policies and a strong centralization of power.