 Isabeau 's parents were Duke Stephen III of Bavaria @-@ Ingolstadt and Taddea Visconti , whom he married for a 100 @,@ 000 ducat dowry . She was most likely born in Munich where she was baptized as Elisabeth at the Church of Our Lady . Hers was the ancient and well @-@ established Wittelsbach family , descended from Charlemagne , and she was great @-@ granddaughter to the Wittelsbach Holy Roman Emperor Louis IV . At that period Bavaria was the most powerful of the German states and divided between members of the House of Wittelsbach . 
