Who is this "philosopher-king" who ruled Prussia during the 18th century?

While the thinkers of the day were putting their great minds to work, some of the top leaders of the day took these admirable ideals into account. One of those leaders was the ruler of the Kingdom of Prussia, Frederick II. He was known as the "philosopher-king," as he was a regular correspondent with the Enlightenment's leading minds, including Voltaire. A patron of the arts and sciences, the Prussian leader's military tactics made his kingdom a major contender during the 18th century.

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