Frederick I (c. 912 – 18 May 978) was the count of Bar and duke of Upper Lorraine. He was a son of Wigeric, count of Bidgau, also count palatine of Lorraine, and Cunigunda, and thus a sixth-generation descendant of Charlemagne.
In 954, he married Beatrice, daughter of Hugh the Great, count of Paris, and Hedwig of Saxony. He received in dowry the revenues of the abbey of Saint-Denis in Lorraine. To stop incursions from the duchy of Champagne, Frederick constructed a castle over the Ornain River in 960, and later occupied the confiscated lands of Saint-Mihiel. He exchanged fiefs with the bishop of Toul. Thus, he created his feudal domain, the county of Bar. So he became the founder of the House of Bar or the House of Ardennes–Bar, a cadet branch of the House of Ardennes.
