King Frederick II of Prussia, also known as Frederick the Great, ruled from 1740 to 1786. He is best known for his military successes, particularly during the Seven Years' War, which established Prussia as a major European power. Frederick was also a patron of the arts and philosophy, promoting the ideas of the Enlightenment. Frederick implemented significant reforms in the Prussian state, including improvements in the legal system and education. He is credited with modernizing the army and promoting religious tolerance. His reign is often seen as a period of cultural and political advancement in Prussia.