ROBERT de Pierrepont, son of HUGUES de Pierrepont & his wife Clémence de Rethel (-before 1200). The Chronicle of Alberic de Trois-Fontaines names (in order) "Robertum de Petraponte, patrem comitis Iohannis de Rocheio, Galterum de Wasnou, episcopum Hugonem Leodiensem et Margaretam domnam de Eppa, matrem alterius episcopi Leodiensis nomine Iohannis" as the children of "Clementia, alii dicunt Agatha, [uxor] nobili Hugoni de Wasnou"[1917]. Moret de la Fayole records that “Hugo de Petre-Ponte et filius meus Robertus” donated property to Laon Saint-Martin, naming “predecessorum meorum...Widonis et Roberti” and “Galterius et Willelmus filii mei...fratres Roberti primogeniti mei”, with the consent of “uxor mea et uxor filii mei Eustachia”, by charter dated 19 Jun 1181[1918]. Excommunicated 1183. Seigneur de Montaigu: “Robert de Pierrepont seigneur de Montaigu” approved donations to Foigny made by “Arnoul d’Arançot”, with the consent of “sa femme Eustachie”, by charter dated 1184[1919]. “Robert seigneur de Pierrepont” donated “la dîme...à Evercaigne” to Foigny, with the consent of “Eustachie sa femme, Jean, Hélissende leurs enfants”, by charter dated 1192[1920]. Comte de Roucy. "Johannes comes de Rocey et dominus de Petrapontis" exchanged property at Evergnicourt with Saint-Hubert, Ardenne by charter dated Sep 1225[1921].
m ([1180/19 Jun 1181]) as her first husband, EUSTACHIE de Roucy, daughter of GUISCARD Comte de Roucy & his wife Elisabeth de Mareuil (-[May 1208/1211]). The Chronicle of Alberic de Trois-Fontaines names "Eustachiam" as one of the three daughters of "Wichardum novissimum" & his wife, specifying that she was wife of "Robertus de Petraponte" and mother of "comes…Iohannes"[1922]. Moret de la Fayole records that Guiscard donated revenue from “Planou” to Laon Saint-Martin, with the consent of “uxore mea comitissa Elizabeth et filiis nostris Radulpho, Joanne et Wichardo et filiabus Eustachia et Beatrix, et Millesenda uxore Radulphi”, by charter dated 1180, signed by “Ebali filii eius canonici Rhemensis”[1923]. Moret de la Fayole records that “Hugo de Petre-Ponte et filius meus Robertus” donated property to Laon Saint-Martin, naming “predecessorum meorum...Widonis et Roberti” and “Galterius et Willelmus filii mei...fratres Roberti primogeniti mei”, with the consent of “uxor mea et uxor filii mei Eustachia”, by charter dated 19 Jun 1181[1924]. “Robert de Pierrepont seigneur de Montaigu” approved donations to Foigny made by “Arnoul d’Arançot”, with the consent of “sa femme Eustachie”, by charter dated 1184[1925]. “Robert seigneur de Pierrepont” donated “la dîme...à Evercaigne” to Foigny, with the consent of “Eustachie sa femme, Jean, Hélissende leurs enfants”, by charter dated 1192[1926]. She succeeded her brother as Ctss de Roucy. She married secondly (1200 or before, divorced [1200/04]) as his first wife, Enguerrand [III] Seigneur de Coucy. The justification for this second marriage is as follows. "Ingelrannus dominus Cociaci" confirmed property of the church of Laon by charter dated 1200 in the presence of "uxore mea Eustachia, et fratribus meis Thoma et Roberto"[1927]. Her second husband called himself Comte de Roucy in 1202: "Ingelrannus de Couciaco comes Rociaci" donated property to Bassoles lés Anlers, with the consent of “Thomas et Robertus fratres nostri”, by charter dated Jun 1202[1928]. The Lignages de Coucy (written in 1303) records that "Enguerrant [Enguerrand [III] Seigneur de Coucy] ot trois femmes, la premiere...la contesse du Perche, la seconde...la contesse de Roucy", both marriages being childless[1929]. While this source reverses the order of the marriages, it confirms that Enguerrand did at one time marry a comtesse de Roucy. Du Chesne interprets the documentation differently, stating that Enguerrand married firstly "Beatrix de Vignory veuve de Jean I...comte de Roucy"[1930]. The 1200 charter which names Eustachie indicates that Du Chesne cannot be correct and that Enguerrand’s wife was the widow of Robert de Pierrepont. If the hypothesis shown here is correct, Enguerrand must have divorced Eustachie soon after the marriage. She is named in a charter dated May 1208: "Eustachia comitissa Rosceii" confirmed the agreement made by "domnus Airardus de Brana" with the abbot of Reims Saint-Rémy concerning "feodo vicecomitatu Condati super Maternam", with the consent of "filium meum Ioannem et…duabus filiabus meis Aalis et Helizabeth"[1931], and Enguerrand’s second marriage is dated to [1204].
Robert & his wife had four children