Final answer:
Frederick William I, also known as the 'Soldier King,' reigned in Prussia from 1713 to 1740, focusing on military and bureaucratic efficiency.
Step-by-step explanation:
The student has inquired about the rule of Frederick William I, who was a prominent Prussian monarch. Frederick William I is known as the "Soldier King," and he reigned in Prussia from 1713 until his death in 1740. Under his rule, Prussia became known for its military efficiency and austerity, as he focused heavily on building a strong army and creating a centralized bureaucratic state. His contributions set the stage for Prussia to become a major European power, particularly under the leadership of his son, Frederick the Great, during the subsequent Seven Years' War.