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Madre de Adalard "le Sénéchal"; Gérard II, count of Roussillon and Ingeltrude of The Franks of Orleans
Leuthard married Grimhilda with whom he had the following children:
Engeltrude of Fézensac, wife of Odo of Orléans, and mother of Ermentrude of Orléans who married future emperor Charles the Bald.
Adalard the Seneschal (seneschal of the Carolingian empire under the reign of Louis the Pious)
Girart de Roussillon (or Gerard II of Paris), count of Paris, Roussillon, and Vienne.
In 801, Leuthard followed Emperor Louis the Pious in his expedition to Spain and participated in the capture of Barcelona, for which he received the county of Fezensac in the duchy of Aquitaine, where he became the first count. In 809, he was involved in the siege of Tortosa.