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Erard of Bar, (French: Érard de Bar) was a monk by 1292 and then seigneur de Pierrepont, Meurthe-et-Moselle et d'Ancerville by 1302. Erard was one of eight sons born to Theobald II, Count of Bar and his wife, Jeanne de Toucy.

He married Isabella of Lorraine (d. 12 December 1353), daughter of Theobald II, Duke of Lorraine, and Isabelle de Rumigny; they had had six children. Erard died in 1335 at Pierrepont, France.