In medieval France, Roucy was a county held by a succession of noble families.
By the Late Middle Ages, it was one of seven titles that was made a peer within the provincial peerage of the greater County and Province of Champagne up until the French Revolution.
→ Siblings of counts Simon and Robert II: Hugh of Pierrepont, Vidame of Laon by his marriage to Marie de Clacy-et-Thierret / Clacy; Béatrice, x Louis II of Sancerre → Their daughters Marguerite, Lady of Albert, and Blanche of Roucy-Pierrepont, married respectively: in 1403 Thomas III del Vasto, Marquess of Saluzzo (hence Giovanna, Dame d'Encre, wife of Guy IV de Clermont-Nesle); and in 1414 Louis I of Bourbon-Vendôme, Count of Vendôme, Grand Master of France. In 1767 he sold his title to a very distant cousin, Jacques Henri Salomon Joseph de Roucy (1747-1814), Lord of Manre (his family also owned Termes and Marvaux in the vicinity), from Hugues de Thosny and du Bois younger brother of Count Robert Guiscard above, known as Count of Roucy, field marshal and colonel of the Queen's cavalry regiment, husband of Marie Perrine de Scépeaux, but died without posterity in 1814.