Answer
Ermengarde of Hesbaye (c. 780 – 28 July 851) was the wife of Lothair I, King of Lotharingia and Holy Roman Emperor, and a daughter of Count Ingram of Hesbaye and Kunigunde of Saxony. Ermengarde's marriage to Lothair was a political alliance between the Carolingian and Saxon royal families, and the couple had eight children.