SIMON de Dammartin, son of AUBRY [II] Comte de Dammartin & his wife Mathilde [Mabile] de Clermont-en-Beauvaisis (-21 Sep 1239). "Reginaldus comes Bolonie" donated property to Jumièges, for the soul of "Alberici patris mei comitis Dampnimartini in eadem ecclesia sepulti", with the consent of "Yde uxoris mee comitisse Bolonie, Radulfi et Simonis fratrum meorum et sororum mearum", by charter dated [19 Sep/Dec] 1200[1337]. The Chronicon Andrensis names "comes Bolonie Reinaldus et Simon frater eius", specifying that Simon married "filiam comitis Pontivi unicam"[1338]. Comte d'Aumâle 1205/11. "Renaldus comes Bolonie" confirmed the marriage contract between "Guillelmum comitem Pontivi et Mariam eiusdem comitis filiam" and "Simonem fratrem meum" by charter dated Sep 1208[1339]. Comte de Ponthieu et de Montreuil. "Symon comes Pontivi…Maria comitissa Pontivi" agreed with Louis IX King of France not to marry "de duabus filiabus nostris promogenitis" without consent of the king, dated Mar 1231[1340]. The Chronicle of Alberic de Trois-Fontaines records the death in 1239 of "comes de Pontivo Symon"[1341].
m (contract Sep 1208) as her first husband, MARIE de Ponthieu, daughter of GUILLAUME [II] "Talvas" Comte de Ponthieu & his wife Alix de France (before 17 Apr 1199-Sep 1250). The De Rebus Hispaniæ of Rodericus Ximenes names "Mariam…mater Joannæ Reginæ Castellæ et Legionis" as the daughter of "Comitis de Pontivo" and his wife "Adelodis" daughter of "Ludovico Regi Francorum" (and his wife "Elisabeth", an error for Constanza [1342]. "Willelmus comes Pontivi et Monstreoli" donated property to the church of Saint Giosse, with the consent of "Marie filie mee et Aelis uxoris mee", by charter dated 1205[1343]. "Willelmus comes Pontivi et Monstreoli…et Aalais uxor mea comitissa Pontivi et Maria filia mea" granted concessions by charter dated 1207[1344]. "Willelmus comes Pontivi et Monstreoli" granted rights to one of his vassals, with the consent of "Aalis, uxoris mee Ludovici regis filie et Marie filie mee", by charter dated Aug 1208[1345]. "Renaldus comes Bolonie" confirmed the marriage contract between "Guillelmum comitem Pontivi et Mariam eiusdem comitis filiam" and "Simonem fratrem meum" by charter dated Sep 1208[1346]. "Willelmus comes Pontivi et Monstreoli" granted rights to the commune of Maioc, with the consent of "Aalis, uxoris mee et Symonis de Bolonia, generis mei, et Marie filie mee, uxoris eius", by charter dated 1209[1347]. "Guilelmus comes Pontivi et Monstrolii" donated property to Saint-Maurice d´Agaune, for the souls of "Alaidis uxoris meæ et Mariæ filiæ meæ", by charter dated Mar 1210[1348]. "Willaume comte de Pontieu et de Montreuil" agreed a concession made by one of his vassals, with the consent of "Aalis sa femme et de Marie leur fille" by charter dated Nov 1211[1349]. She succeeded her father in 1221 as Ctss de Ponthieu. "Maria comitissa Pontivi" wrote to Louis VIII King of France request consent for the future succession to Ponthieu by "filiorum et filiarum mearum" is dated Jul 1225[1350]. Louis VIII King of France confirmed an agreement with "consanguinea nostra Maria comitissa Pontivi" related to the rights of succession of her "filios et filios quos susceperat a Simone fratre comitis Renaldi Bolonie" and that her husband would not inherit the county of Ponthieu, by charter dated 1225[1351]. "Maria comitissa Pontivi" acknowledged receipt of "duo milia librarum" from King Louis VIII, dated Dec 1225[1352]. "Symon comes Pontivi et Monsteroli et Maria uxor mea" confirmed a donation of property to the abbey of Notre-Dame d'Ourscamp by "Johannes comes Pontivi" by charter dated 2 Mar 1230[1353]. "Maria comitissa Pontivi et Monstreoli" donated property to the church of Boulogne in memory of "Symon comes Pontivi et Monstreoli…maritus meus" by charter dated Oct 1239[1354]. The primary source which confirms her second marriage has not yet been identified, although it is suggested by the charter dated Sep 1242 under which "Matheus comes Pontivi et Monstreoli et Maria uxor eius, comitissa" noted property sales[1355]. She married secondly ([Sep 1240/15 Dec 1241]) Mathieu de Montmorency Seigneur d'Attichy. The barons of the Cinque Ports in England wrote to "domine Marie, de Pontivo et Monstreolo comitisse", dated Aug 1250, replying to her claims respecting commercial rights[1356].
Comte Simon & his wife had four children