Frederik II, also known as Frederik the Great, was the King of Prussia from 1740 to 1786. He is renowned for his military victories, administrative reforms, and promotion of the arts and philosophy. Under his rule, Prussia became a major European power, expanding its territory and influence. Frederik II was a proponent of Enlightenment ideas, advocating for religious tolerance and legal reforms. He corresponded with prominent thinkers like Voltaire and implemented policies that modernized the Prussian state. His legacy includes a strong military and a more centralized government, shaping the future of Germany.