Ermengard von Bayern, Äbtissin von Chiemsee

https://fmg.ac/Projects/MedLands/GERMANY,%20Kings.htm#LudwigIIleGer...

"3. ERMENGARDIS (-Frauenwörth 16 Jul 866). "Hludowicus…rex" confirmed an exchange between "filia nostra Irmingart" and abbot Folkwin of Reichenau in a charter dated 28 Apr 857[38]. Abbess of Buchau am Federsee. Abbess of Chiemsee (Frauenwörth) 28 Apr 857. The Annales Formoselenses record the death in 866 of "Karoli regis soror Irmingard"[39]. This is corroborated by the Annales Alamannicorum[40]. The necrology of St Gall records the death "XVII Kal Aug" of "Irmingarda Hludowici regis filia et sanctimonialis"[41]."