- https://fr.wikipedia.org/wiki/Sibylle_de_Gu%C3%AEnes

Sibylle (Rose) de Guines, first wife of Henri Bourbourg

Daughter of Manasses, Comte de Guines and his wife Emma d´Arques. Married Henri de Bourbourg, Châtelain de Bourbourg, son of Themard (Theinard) Châtelain de Bourbourg and his wife (unknown name). She was his first wife

Children:

1. Beatrix (Beatrice) de Bourbourg, born after 1120, died 1146. She married (1) Aubrey III de Vere, son of AUBREY II de Vere & his wife Adelisa (Alice) de Clare and (2) Baudouin Seigneur d'Ardres

Source

1. Medlands Northern France Nobility - Henri Bourbourg
2. Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Ltd, 2000, page: X:Appendix J:119 - 120

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-http://fmg.ac/Projects/MedLands/NORTHERN%20FRANCE.htm#SibylleRoseGu...

a) SIBYLLE [Rose] de Guines (-after 1120). The Historia Comitum Ghisnensium names "Sibillam…Rosam nominatam" as the only daughter of "Manasses [comes Ghisnensi]" & his wife, naming her husband "castellano Broburgensi Henrico" and specifying that she was buried "in monasterio beate Marie de Capella"[990]. “Manasses Gisnensis comes et Emma uxor eius…filia Willielmi de Arras” founded Redlingfield priory by charter dated 1120, witnessed by “Widonis fratris mei, Rosæ filiæ meæ”[991]. “Manasses…Gisnensium comes…cum uxore mea Emma et filia Rosa” confirmed possessions of Andres by undated charter[992].

m as his first wife, HENRI Châtelain de Bourbourg, son of THEMARD Châtelain de Bourbourg & his wife Livildis --- (-after 1162, bur Saint-Bertin).

From Lambert (Lambertus Ardensis), curé d'Ardre and his Chronique De Guines Et D'Ardre (918-1203)…
c. 1112 Rose, fille unique du comte Manasses, mariée à Henri I, châtelain de Bourbourg, accouche d'une fille, Béatrix, et meurt.
c. 1112 Rose, only daughter of Count Manasses, married to Henri I, lord of Bourbourg, gives birth to a daughter, Béatrix, and (Rose) dies.

CH. XLII. Comment le comte Manasses engendra une fille nommée Rose, de laquelle descendit une aultre fille nommée Beatrix.

Le conte Manasses engendra de Emme sa femme une fille de son propre nom appellée Sibille, aultrement surnommée Roze; laquelle venue en age fut aliée à Henry, chastelain de Bourbourg, dont decendit une fille nominée Beatrix; et c'est après la nativité de ladicte Beatrix, sa mere nommée Roze, aultrement Sibille, mourut; qui fut dommaige. Et a grand doeul en plainte de ceulx du pais, fut son corps inhumé audict, monastere de la Chapelle, devant l'autel S. Benoist.

CH. XLII. How the count Manasses begat a daughter named Rose, from whom descended another daughter named Beatrix.

The count Manasses begat from Emme his wife a daughter of his own name his own name called Sibille, also nicknamed Roze; who when she came of age was allied to Henry, chastelain of Bourbourg, from whom a daughter named Beatrix descended; and it is after the birth of the said Beatrix, her mother named Roze, also Sibille, died; which was a damage. And with a great sorrow in complaint of those of the country, her body was buried at the monastery of La Chapelle, in front of the altar of S. Benoist altar. (Lambert, 100)

(Ardensis), Lambert. Historia Comitum Ghisnensium ; Chronique De Guines Et D'Ardre (918-1203). Edited by Godefroy Denis-Charles Menilglaise, vol. 1, J. Renouard, 1855. XXXVI-543 p. https://gallica.bnf.fr/ark:/12148/bpt6k36194g/f3.item