Theodoric I (born c. 965, died between 11 April 1026 and 12 January 1027) was the count of Bar and duke of Upper Lorraine from 978 to his death. He was the son and successor of Frederick I and Beatrice, daughter of Hugh the Great, count of Paris, and sister to the French king Hugh Capet.

His mother was the regent until 987. In 985, he joined the other Lorrainer lords, his including his cousin Godfrey the Prisoner, in trying to repel King Lothair of France's invasion: but at Verdun, he was captured.

Like almost all the dukes of Lorraine until the Gallicisation of the region in the thirteenth century, Theodoric was loyal to the Holy Roman Emperors. In 1011, he aided Henry II in his war with Luxembourg. He was captured a second time in 1018 in combat with Burgundy, but overcame Odo II of Blois, also count of Meaux, Chartres, and Troyes (later Champagne). In 1019, he associated his son, Frederick, in the government with him. He briefly opposed the Emperor Conrad II, Henry's successor, but soon joined his supporters.

He married Richilde, the daughter of Folmar III, count of Bliesgau and Metz, in 985. They had the following children:

Frederick, his successor

Adela (b. c.990), married Walram I, count of Arlon

Adalbero

His mother was the regent until 987. In 985, he joined the other Lorrainer lords, his including his cousin Godfrey the Prisoner, in trying to repel King Lothair of France's invasion: but at Verdun, he was captured.

Like almost all the dukes of Lorraine until the Gallicisation of the region in the thirteenth century, Theodoric was loyal to the Holy Roman Emperors. In 1011, he aided Henry II in his war with Luxembourg. He was captured a second time in 1018 in combat with Burgundy, but overcame Odo II of Blois, also count of Meaux, Chartres, and Troyes (later Champagne). In 1019, he associated his son, Frederick, in the government with him. He briefly opposed the Emperor Conrad II, Henry's successor, but soon joined his supporters.

He married Richilde, the daughter of Folmar III, count of Bliesgau and Metz, in 985. They had the following children:

Frederick, his successor

Adela (b. c.990), married Walram I, count of Arlon

Adalbero

Thierry I, Duke of Upper Lorraine a (957 - 1027)

• It is also known as Thierry I, Duke of Lorraine 2 and Thierry, Count of Bar 1
• He is the son of Frederick I, Duke of Upper Lorraine 1 and Beatrice de France 1 .
• He was born in 957 1 . He married Richilde Luneville Metz , daughter of Folmar I, Count of Bliesgau and Bertha of Trier in 985 1 . He died April 11, 1027 1, 3 .

List of known children:

1. Sundgau Hildegard of Lorraine (985-1046) 1 (from Luneville Richilde Metz )
2. Frederick II, Count of Bar (995-1028) 1 (from Luneville Richilde Metz )