Jamus, ko kuma fiye da tsohuwar daular Roma mai tsarki, a cikin karni na 18, ta shiga wani lokaci na raguwa wanda a ƙarshe zai kai ga rushewar daular a lokacin yakin Napoleon.Tun lokacin zaman lafiya na Westphalia a 1648, daular ta rabu zuwa kasashe masu zaman kansu da yawa (Kleintaaterei).A lokacinYaƙin Shekaru Talatin , dakaru dabam-dabam sun yi ta yin tattaki a cikin ƙasashen Hohenzollern da aka katse, musamman ma Swedes da suka mamaye.Frederick William I, ya sake fasalin sojoji don kare filaye kuma ya fara karfafa iko.Frederick William I ya sami Gabashin Pomerania ta hanyar Aminci na Westphalia.Frederick William I ya sake tsara yankunan sa na warwatse kuma ya yi nasarar jefar da vassalage na Prussia a ƙarƙashin Mulkin Poland a lokacin Yaƙin Arewa na Biyu.Ya karbi Duchy na Prussia a matsayin fief daga Sarkin Sweden wanda daga baya ya ba shi cikakken iko a cikin Yarjejeniyar Labiau (Nuwamba 1656).A cikin 1657 Sarkin Poland ya sabunta wannan tallafi a cikin yarjejeniyoyin Wehlau da Bromberg.Tare da Prussia, daular Brandenburg Hohenzollern a yanzu tana da yanki mara nauyi, wanda ya zama tushen daukakar su zuwa ga sarakuna.Domin magance matsalar alƙaluman jama'ar Prussia kusan miliyan uku, ya jawo ƙaura da matsugunan Huguenots na Faransa a cikin birane.Da yawa sun zama masu sana'a da 'yan kasuwa.A cikin Yaƙin Mutanen Espanya, don samun ƙawance da Faransa, an ba ɗan Babban Zaɓaɓɓen, Frederick III, damar ɗaukaka Prussia zuwa masarauta a cikin yarjejeniyar Crown na 16 Nuwamba 1700. Frederick ya lashe kansa "Sarki a Prussia" kamar yadda Frederick I a ranar 18 ga Janairu 1701. A bisa doka, babu wasu masarautu da za su iya wanzuwa a cikin Daular Roma mai tsarki sai Bohemia.Duk da haka, Frederick ya ɗauki layin cewa tun da Prussia ba ta kasance wani ɓangare na daular ba kuma Hohenzollerns sun kasance masu cikakken iko a kansa, zai iya daukaka Prussia zuwa mulki.