Kafuwar Masarautar Bavaria ta samo asali ne tun hawan yarima mai zaɓe Maximilian IV Joseph na House of Wittelsbach a matsayin Sarkin Bavaria a 1805. Aminci na Pressburg na 1805 ya ba Maximilian damar haɓaka Bavaria zuwa matsayin masarauta.Har yanzu Sarkin ya yi aiki a matsayin mai zaɓe har zuwa lokacin da Bavaria ta balle daga Daular Roma Mai Tsarki a ranar 1 ga Agustan 1806. An ba da Duchy na Berg ga Napoleon kawai a cikin 1806. Sabuwar masarauta ta fuskanci ƙalubale tun farkon ƙirƙirar ta, ta dogara ga goyon bayan Napoleon. FaransaMasarautar ta fuskanci yaki da Ostiriya a 1808 kuma daga 1810 zuwa 1814, ta rasa yanki zuwa Württemberg, Italiya, sannan Austria.A cikin 1808, an kawar da duk abubuwan da aka yi amfani da su na serfdom, wanda ya bar tsohuwar daular.A lokacin da Faransa ta mamaye Rasha a shekara ta 1812 an kashe sojojin Bavaria kusan 30,000 a wani mataki.Tare da Yarjejeniyar Ried na 8 Oktoba 1813 Bavaria ta bar ƙungiyar Rhine kuma ta amince ta shiga haɗin gwiwa na shida da Napoleon don musanya don ba da tabbacin ci gaba da matsayinta na sarauta.A ranar 14 ga Oktoba, Bavaria ta ba da sanarwar yaƙi da Napoleon Faransa.Yarima mai jiran gado Ludwig da Marshal von Wrede sun goyi bayan yarjejeniyar.Tare da yakin Leipzig a watan Oktoba 1813 ya ƙare yakin Jamus tare da al'ummomin haɗin gwiwar a matsayin masu nasara.Tare da shan kashi na Napoleon na Faransa a 1814, Bavaria ta sami diyya ga wasu asarar da ta yi, kuma ta sami sababbin yankuna kamar Grand Duchy na Würzburg, Archbishopric na Mainz (Aschaffenburg) da kuma sassan Grand Duchy na Hesse.A ƙarshe, a cikin 1816, an ɗauki Rhenish Palatinate daga Faransa don musanya mafi yawan Salzburg wanda aka ba da shi zuwa Austria (Yarjejeniyar Munich (1816)).Ita ce jiha ta biyu mafi girma kuma ta biyu mafi ƙarfi a kudu maso Gabas, bayan Austria kawai.A Jamus gabaɗaya, ta kasance ta uku a bayan Prussia da Austria.a