ホーエンツォレルン家初代君主は誰？
In 1701 the title of King in Prussia was granted, without the Duchy of Prussia being elevated to a Kingdom within the Holy Roman Empire. From 1701 onwards the titles of Duke of Prussia and Elector of Brandenburg were always attached to the title of King in Prussia. The Duke of Prussia adopted the title of king as Frederick I, establishing his status as a monarch whose royal territory lay outside the boundaries of the Holy Roman Empire, with the assent of Emperor Leopold I: Frederick could not be "King of Prussia" because part of Prussia's lands were under the suzerainty of the Crown of the Kingdom of Poland. In the age of absolutism, most monarchs were obsessed with the desire to emulate Louis XIV of France with his luxurious palace at Versailles.
Frederick I