The ruler of Prussia who built up the fourth largest army in Europe in the first half of the eighteenth century was:

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The ruler of Prussia who built up the fourth largest army in Europe in the first half of the eighteenth century was Frederick William I. He was known as the "Soldier King" and made significant reforms in the Prussian military, making it one of the most disciplined and efficient armies in Europe. His son, Frederick II (known as Frederick the Great), further expanded and used this army in his conquests.

The Ruler of Prussia Who Built Up the Fourth Largest