儘管她1171年從父親處繼承了里奇蒙伯國,但直到1183/1184年才繼承。(見 Judith Everard and Michael Jones, The Charters of Duchess Constance and Her Family (1171–1221), The Boydell Press, 1999, p 38)
Judith Everard, Michael Jones, The Charters of Duchess Constance of Brittany and her Family (1171–1221), The Boydell Press, 1999, p 135: "The first occasion on which the names of Constance and Guy are linked is at Angiers in October 1199. (...) cf. also the date of Gu2 [a grant for the monks of Buzay], which records that on 27 August 1201, Guy was still only in his second regnal year."(「康斯坦絲和居伊的名字第一次連結在一起的時間是在1199年10月的昂熱。……也是記錄在1201年8月27日的Gu2(為布扎伊的僧侶提供的一筆贈款)的日期,記錄說居伊仍然只在他的第二個統治年。」)
Margaret of Huntingdon made a donation for the souls of "herself, Duke Conan IV, and 'our boys', or 'our children' (pro salute anime... puerorum... nostrorum)(亨廷頓的瑪格麗特為「她自己,科南四世公爵以及『我們的男孩』或『我們的孩子』的靈魂捐款). This would seem to be a reference to at least one son of the marriage who did not survive infancy, leaving Constance as heiress in 1166."(「這似乎是對至少一個沒有從嬰兒期倖存下來的婚生子的提法,所以倖存下來的康斯坦絲於1166年成為繼承人。」) (Everard and Jones, The Charters of Duchess Constance and Her Family (1171–1221), The Boydell Press, 1999, p 94).
據埃弗拉德說,康斯坦絲的兄弟被稱為吉約姆的事實似乎表明他不是科南四世的私生子,因為威廉(同吉約姆)是亨廷頓的瑪格麗特的一個兄弟的名字。 (Everard, Judith (2000). Brittany and the Angevins: Province and Empire, 1158-1203. Cambridge University Press, 2000, p 43).
Eales, Richard. Ranulf (III), sixth earl of Chester and first earl of Lincoln (1170–1232). Oxford Dictionary of National Biography online. Oxford University Press. 2008 [2004].
Borgnis Desbordes, Eric, Constance de Bretagne (1161–1201), une duchesse face à Richard Cœur de Lion et Jean sans Terre, Yoran embanner, 2018, p. 408-409
Michael Jones, « Eleanor, suo jure duchess of Brittany (1182x4–1241) », Oxford Dictionary of National Biography, Oxford University Press, 2004 ; online edition, January 2008.
Quaghebeur, Joëlle. La Cornouaille du IXème au XIIème siècles : mémoire, pouvoirs, noblesse, Rennes Quimper, Presses universitaires de Rennes, Société archéologique du Finistère, 2002, p. 367.
Borgnis Desbordes, Eric, Constance de Bretagne (1161-1201), une duchesse face à Richard Cœur de Lion et Jean sans Terre, Yoran embanner, 2018, p. 437, note 200
More information 布列塔尼女公爵康斯坦絲 彭蒂耶夫王朝(英語:Counts and dukes of Penthièvre)出生於:1161年逝世於:1201年, 統治者頭銜 ...