Frederick William I of Prussia, known as the "Soldier King," ruled from 1713 to 1740. He is recognized for his military reforms and for establishing a strong, disciplined army. His reign focused on strengthening the state and increasing its power, which laid the groundwork for the future expansion of the Prussian Empire. Frederick William I was also known for his frugality and emphasis on efficiency in governance. He promoted the development of Prussia's economy and infrastructure, while also fostering a culture of loyalty among his subjects. His legacy influenced later rulers, including his son, Frederick II, who expanded Prussia's territories.