King Frederick William I of Prussia, who reigned from 1713 to 1740, was known for his strong military focus and efforts to modernize the Prussian army. He emphasized discipline and efficiency, transforming Prussia into a formidable military power in Europe. His reign is often marked by the establishment of a professional standing army. Frederick William I was also notable for his frugality and austere lifestyle, which earned him the nickname "the Soldier King." He invested in infrastructure and education, laying the groundwork for future economic growth. His son, Frederick II, later known as Frederick the Great, would continue his legacy and expand Prussia's influence.