William George of Sayn-Hachenburg German noble (1751–1777) Parents John, Count Palatine of Gelnhausen William Louis of Kirchberg Louise de Salm-Dhaun Sophie Charlotte of Salm-Dhaun Children Burgravine Louise Isabelle of Kirchberg Siblings Luise Christiane of Birkenfeld-Gelnhausen Duke Wilhelm in Bavaria Johann Carl Ludwig von Birkenfeld-Gelnhausen Partners Isabella Augusta Reuß zu Greiz