Baudouin III de Bailleul, Châtelain de Bailleul, Châtelain d’Ypres

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1. BAUDOUIN [III] de Bailleul ([1155/65]-after 1201). If the speculation about Baudouin [II]’s succession to Ypres after marrying the heiress is correct, Baudouin [III] would presumably have been born from that marriage to qualify him for succession as châtelain. “Baudouin de Bailleul et Baudouin son fils” donated property to Clermarests abbey by charter dated 1172[2361]. Châtelain d’Ypres: “Dominus Baldewinus castellanus Yprensis” donated produce from his mill in Ypres to the leprosorium at Ypres, before leaving for Jerusalem, by charter dated 1187, which also records that “mortuo...predicto domino Baldewino castellano Yprense, filius eius dominus Baldewinus” succeeded as “novus castellanus” and redeemed the payment[2362]. “Gerardus castellanus de Aldeburg” recalled the donation of property “apud villam Erdenka” made to Saint-Godard hospital by “frater meus Balduinus de Balliolo”, for the soul of “fratris sui Hostonis”, adding a donation “postmodum ad eandem fratris mei successissem hereditatem quam habebat in Erdenka” made “per manum domini et nepotis mei Balduini”, with the consent of “Vergina uxore mea”, by charter dated 1201[2363].

m [MABILE de Bourbourg, daughter of HENRI Châtelain de Bourbourg & his second wife Beatrix van Aalst]. The Historia Comitum Ghisnensium names "Mabilia…Mathildis…Luthgarda…Adelidis…Beatrix" as the five daughters of "Broburgensi castellano Henrico, Deinardi filio" and his wife Beatrix, adding that Mabile married "Balduino de Bailliolo" and "facta est Yprensis vicecomitissa"[2364]. The identity of Mabile’s husband is uncertain. If she was born towards the end of her father’s life ([1255/62]), she could have been the husband of Baudouin [III] de Bailleul. This would also explain the transmission of the name Mabile to her supposed granddaughter (assuming that the reconstruction of this family is correct as shown here). Another possibility is that she was the husband of Baudouin [II]. In that case, she would have been his second wife and could not have been the mother of his known son as the châtellenie of Ypres could not have been transmitted to him through her. Baudouin [III] & his wife had [one child]:

a) [AGNES ([before 1180]-before Oct 1219). Dame de Bailleul. Dame de Fenaing. "Agnes de Balluele domina de Fenaing et…Adam de Walencourt et uxor mea Mabilia filia ipsius Agnetis" donated revenue from Fenaing to the church of Beaurepaire by charter dated 28 Jun 1212[2365]. She is named in the charter dated Oct 1219 under which [her daughter] "Mabilia castellana de Ypra et de Balliolo filia domine Agnetis bone memorie, condam domine de eodem Balliolo" donated property to "Henrico, filio Roberti de Hermecort", with the consent of "mariti mei Hugonis filii comitis de Retiest"[2366]. Agnes’s parentage is uncertain. Her description in the Oct 1219 charter as “domine de...Balliolo” suggests that she had held the title in her own right, not through her husband. If that is correct, she was the direct descendant of Baudouin [II] de Bailleul Châtelain d’Ypres. Lambin (in his 1838 study of the family which is unsatisfactory because of the absence of source citations) indicates “Agnes d’Ypres” as the wife of Baudouin [II] de Bailleul Châtelain d’Ypres (and daughter of Châtelain Anselme), and mother of Châtelaine Mabile[2367]. From a chronological point of view, this explanation is unsatisfactory. Considering her daughter Mabile’s second marriage in [1218/19], it is unlikely that Agnes’s marriage was dated to before 1158 (the date of the first known document in which Baudouin [II] is called “châtelain d’Ypres”). The reconstruction which best fits the currently known facts is that Agnes was the daughter of Baudouin [III]. m ---, son of ---.

https://fmg.ac/Projects/MedLands/FLEMISH%20NOBILITY.htm#BaudouinBai...
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I176 (O. Mus : Leprozerij, I, pp. 55-59, nO. I); 1180 (Mir.-Fopp., II, p. I3I9) -
I20I (Nonnenbossche, no. XXI, p. 8I).
Castellan of Ypres (SMYpres, I, no. 37, p. 26 (I183)) and Bailleul (Gros
Brief, p. 179 (I187)).

• Mabilia of Bourbourg (Lambert of Ardres, SS. XxxIV, p. 621, C. 122) before

I184, January 3 (Bourbourg, I, no. LXXVII, pp. 81-84). (Warlop, 639)