Thierry Montbeliard, born around 1045 and died on January 2, 1105, was a count of Montbeliard, and Altkirch Ferrette (Thierry I) from 1073 to 1105, a count of Bar and a lord of Mousson (Thierry II) 1093 in 1105 and one count of Verdun from 1100 to 1105. He was the son of Louis de Scarpone, Count of Montbeliard, and Altkirch Ferrette, and Sophie, Countess of Bar and lady Mousson.
At his father's death, he claims the estate of the Duchy of Lorraine, that his father had already claimed. It is dismissed by the emperor Henry IV. In retaliation, it is ravaging the diocese of Metz, but it was defeated by Adalbéron III, bishop of Metz, and the Duke of Lorraine Thierry II. Réconcilié with the Church, he founded an abbey in 1074 in Haguenau and rebuild the church Montbéliard in 1080. It not participate at the Council of Clermont in 1095, or the Crusades, but sends his son Louis, which took it upon itself. In 1100, the Bishop of Verdun gives the county as life, but the relationship between the spiritual and temporal powers are turbulent.
He married in 1065 Ermentrude de Bourgogne (born in 1055 and died in 1105), daughter of William I, Comte de Bourgogne, and Étiennette and:
* Thierry II (1081 1163), Count Montbeliard
* Louis, which took a crusade, returned in 1102 and was assassinated in 1103
* Frederick I († 1160), Count of Ferrette and Altkirch
* I Renaud (1090 † 1150), Count of Bar and lord of Mousson
* Stephen (1162), bishop of Metz
* Guillaume, who died before 1105
* Hughes, cited in 1105, probably religious, because it does not enjoyed sharing his father's possessions
Gunthilde * (1331), abbess of Biblisheim
* Agnes, married in 1104 (1136)
Thierry de Montbeliard I 
