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Giselbert was Count of Darnau from 846-863.

Emperor Lothaire & his wife had eight children: ... 3. daughter ([825/30]-). The Gesta Francorum records that "Gisalbertus, vassallus Karoli" abducted "filiam Hlotharii imperatoris" and took her to Aquitaine where they were married[21]. The Annales Fuldenses also record that "Gisalbertus vassallus Karoli" abducted "filiam Hlotharii imperatoris" and married her in Aquitaine in 846[22]. The Annales Mettenses also date this event in 846[23]. Settipani states that the emperor recognised the marriage in 849[24]. Rösch says that this daughter is often named Ermengarde in secondary sources but that there is no contemporary proof that this is correct[25]. m (Aquitaine 846) GISELBERT Graf von Maasgau, son of --- (-after 14 Jun 877).
Sources

[21] Gesta quorundam regum Francorum 846, MGH SS I, p. 364. [22] Annales Fuldensium Pars Secunda, auctore Euodolfo 846, MGH SS I, p. 364. [23] Annales Mettenses, RCGF 7, p. 186. [24] Settipani (1993), p. 264. [25] Rösch, S. (1977) Caroli Magni Progenies (Verlag Degener & Co, Neustadt an der Aisch), p. 89.

He was Count of Massgau from 839-842.

She probably was the sister of Echard, Count of Hesbaye.

Lothair I was King of Italy 817-55 and Holy Roman Emperor 840-55. He was the grandson of Charlemagne; for his ancestry see Lothair I of Germany.

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Lothair I, or Lothar I, (795 _ March 2, 855), Holy Roman Emperor, was the eldest son of the emperor Louis the Pious and his wife Irmengarde (Ermengarde), daughter of Ingramm (Ingerman), the Duke of Hesbaye.

Little is known of his early life, which was probably passed at the court of his grandfather Charlemagne, until 815 when he became ruler of Bavaria.

When Louis divided the Empire between his sons in 817, Lothar was crowned joint emperor at Aix-la-Chapelle (Aachen) and given a certain superiority over his brothers. In 821 he married Irmengarde (d. 851), daughter of count Hugo (Hugues) of Tours; in 822 he assumed the government of Italy, and on April 5, 823, he was crowned emperor by Pope Paschal I at Rome.

In November 824 he promulgated a statute concerning the relations of pope and emperor which reserved the supreme power to the secular potentate, and he afterwards issued various ordinances for the good government of Italy.

On his return to his father's court his step-mother Judith won his consent to her plan for securing a kingdom for her son Charles the Bald, a scheme which was carried out in 829. Lothar, however, soon changed his attitude and spent the succeeding decade in constant strife over the division of the Empire with his father. He was alternately master of the Empire, and banished and confined to Italy, at one time taking up arms in alliance with his brothers and at another fighting against them, whilst the bounds of his appointed kingdom were in turn extended and reduced.

When Louis I was dying in 840, he sent the imperial insignia to Lothar, who, disregarding the various partitions, claimed the whole of the Empire. Negotiations with his brother Louis the German and his half-brother Charles the Bald, both of whom armed to resist this claim, were followed by an alliance of the younger brothers against Lothar. A decisive battle was fought at Fontenay on June 25, 841, when, in spite of his personal gallantry, Lothar was defeated and fled to Aix. With fresh troops he began a war of plunder, but the forces of his brothers were too strong for him, and taking with him such treasure as he could collect, he abandoned to them his capital.

Peace negotiations began, and in June 842 the brothers met on an island in the Saône, and agreed to an arrangement which developed, after much difficulty and delay, into the Treaty of Verdun signed in August 843. By this Lothair received the imperial title as well as northern Italy and an long stretch of territory from the North Sea to the Mediterranian, essentially along the valleys of the Rhine and the Rhone. He soon left Italy to his eldest son, Louis, and remained in his new kingdom, engaging in alternate quarrels and reconciliations with his brothers and in futile efforts to defend his lands from the attacks of the Northmen (as Vikings were known in Frankish writings) and the Saracens.

In 855 he became seriously ill and, despairing of recovery, renounced the throne, divided his lands between his three sons, and on September 23 entered the monastery of Prüm (Pruem), where he died six days later. He was buried at Prüm, where his remains were found in 1860.

His kingdom was divided among his three sons _ the eldest, Louis II, received Italy and the title of Emperor; the second, Lothair II, received Lotharingia, while the youngest, Charles, received Burgundy.

Irmengarde (Ermengarde) de Tours.