She is named by Orderic Vitalis, who calls her father "Duke Engelbert", when recording her marriage. The Chronicle of Alberic de Trois-Fontaines records in 1125 that “domnus Norbertus Premonstratensis ordinis institutor” was sent by "comite Campanie Theobaldo" to Germany to negotiate his marriage with "filiam...Ingelberti...marchionis Foroiuliensis", adding that “fratres eiusdem Ingelberti erant episcopus Ratisbonensis et archiepiscopus Coloniensis Fredericus”. The same source names "comitissa Mathildis Campaniensis et uxor Renaldi comitis Nivernensis et comitissa Montis Veteris iuxta Coloniam et mater illorum Romanorum qui Froiepain dicuntur" as sisters of "archiepiscopi Coloniensis Frederici". In the case of the two sisters named first (of which the wife of Thibaut IV Comte de Blois was the older), other sources confirm that they were daughters of Engelbert Marchese of Istria [Duke of Carinthia]. Ascertaining the precise family relationship between all four presumed sisters and Friedrich [I] Archbishop of Köln depends on interpreting apparently contradictory sources which link the archbishop with the Sponheim and Schwarzenberg/Regensberg families...
"Teobaudus Blesensis comes" made a donation to Montiérender by charter dated 1139 with the consent of "Matildis comitissa uxor mee et Henricus filius meus". "Comitissa Mathildis et filius eius Henricus et Theobaudus et Stephanus" donated property to the abbey of Fontevraud by charter dated to [1125/49].
A list of foundations at Troyes records the memory "13 Dec" of "Mathilde épouse du comte Thibaut". The necrology of Saint-Etienne, Troyes records the death "13 Dec" of "Mathildis comitissa". The necrology of Chartres cathedral records the death "Id Dec" of "comitissa Mathildis mater…archiepiscopi Senonensis Willelmi et…Henrici comitis, Teobaldi comitis atque comitis Stephani". 1
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