He reigned over the German state of Prussia from 1740 to 1786. His people called him "The Great," for he brought great military prestige to his country after the Seven Years' War. Who was he?

The Prussian king who reigned from 1740 to 1786 was indeed Frederick II, better known to history as Frederick the Great (Review). He earned this title primarily through his remarkable military prowess and strategic genius. The clue specifically mentions the Seven Years' War (1756-1763), a conflict where his small kingdom of Prussia was pitted against a powerful coalition that included Austria, France, and Russia. Despite being vastly outnumbered, Frederick's brilliant leadership on the battlefield secured Prussia's survival and elevated it to the status of a major European power, cementing his reputation as one of history's greatest military commanders.

Beyond the battlefield, Frederick was a fascinating and complex figure who embodied the era's ideal of an "enlightened absolutist." A devoted patron of the arts and sciences, he was a talented musician and composer who played the flute, and he maintained a long and famous correspondence with the French philosopher Voltaire. As king, he instituted numerous domestic reforms, including modernizing the Prussian bureaucracy, promoting a degree of religious tolerance, and developing a unified code of law. This unique combination of a fearsome warrior and a cultured philosopher-king made him one of the most influential monarchs of the 18th century.