Hildegard (828 – December 23 856 or 859) was the daughter of Louis the German, Carolingian king of East Francia, and his wife Hemma.

Hildegard was the eldest child of Louis the German and the countess Hemma, born a year after their marriage.

In 844, she became the abbess of Münsterschwarzach in Bavaria, the Eigenkloster of the Carolingian court, founded in 780.

While travelling to Zürich to pray at the chapel of Saints Felix and Regula, they saw a deer with lighted antlers, who led them through the forest to a location beside the River Limmat.

The sisters took this as a sign from God that a church was to be built at that location, and Louis the German obeyed this divine invitation.