Family/Spouse: Holy Roman Empire, Abbesse of LAON Hildegarde Princess of The. Hildegarde (daughter of Empire, EMPEROR Louis I "The Fair" Emperor Holy Roman and Hesbaye, EMPRESS OF THE HOLY ROMAN Ermengarde (Irmengarde) Princess of) was born about 801 in Of, France; died after 841 in , Laon, Belgium. [Group Sheet] [Family Chart]