Guy of Bar-sur-Seine

Guy I of Bar-sur-Seine (1105 - 1146) was the count of Bar-sur-Seine in the county of Champagne. He was the son of Milo II of Bar-sur-Seine and of Mathilde of Noyers.

Biography
Guy became count of Bar-sur-Seine on the death of his father Milo II of Bar-sur-Seine. At his death, with his son Milo III of Bar-sur-Seine being on crusade in the Holy Land, the county of Bar-sur-Seine was administered by his wife Pétronille. Following his death, his youngest daughter Ermesinde was born.

Marriage and issue
Guy married Pétronille de Chacenay, daughter of Anséric II de Chacenay and Hombeline. They had:
 * Milo III of Bar-sur-Seine, succeeded his father
 * William of Bar-sur-Seine, probably died young (before 1151)
 * Guy de Bar-sur-Seine, probably died young (before 1151)
 * Manassès de Bar-sur-Seine, succeeded his brother
 * Theobald de Bar-sur-Seine, lord of Champlost, married Marguerite de Chacenay, daughter of Jacques I of Chacenay and Agnès of Brienne
 * Ermesinde of Bar-sur-Seine, married Anseau II of Traînel then Theobald I, Count of Bar