Ermengarde, or Irmengarde de Hesbaye (born about 778) was the daughter of Count Ingerman, Count of Hesbania (Hesbaye, now in Liège, Belgium) and Hedwig of Bavaria.
She married in 794 or 795 Louis I, king of Aquitania, king of Franks, king of Italy, ruler of the Holy Roman Empire.
She had six children :
Lothar I, born 795 in Altdorf, Bavaria
Pepin I, born 797
Adelaide, born. ca. 799
Rotrude, born 800
Hildegard / Matilda, born ca. 802
Louis II "the German", born ca. 805,
She died at Angers, France on 3 October 818.