About 794 Ermengarde married Louis the Pious,[1] son of Charlemagne, who since 781 ruled as a King of Aquitaine.
Ermengarde gave birth to six children: Charlemagne initially intended to divide his Carolingian Empire between Louis and his brothers Pepin and Charles, who nevertheless died in quick succession in 810/11.
Ermengarde's husband became sole emperor and king of the Franks upon his father's death on 28 January 814.
The couple was anointed and crowned emperor and empress by Pope Stephen IV on 5 October 816 in Reims Cathedral.
[4] A few years after her death, her husband remarried to Judith of Bavaria, who bore him Charles the Bald.