Research Notes:

The Chronicon Trenorciensi records that "Constantiæ…filia Roberti Ducis" married firstly "Hugonis Cabilonensis Comitis" and secondly "Hispaniæ Rex Adefonsus". Considering the estimated date of her first marriage, it is unlikely that Constance was born before [1045]. She was therefore considerably younger than her brothers. A charter dated 5 Aug 1087 of "Ducem Burgundiæ Oddonem" restored property to Tournus abbey by "comitissa Cabillonensis filia Rotberti ducis", after the death of "mariti sui Hugonis comitis", adding that she subsequently became "Regina Galliciæ et Hispaniarum". "Infanta donna Urraka Regis domni Adefonsi filia" names her mother "Constantie regina" in her donation to Cluny dated 22 Feb 1117 "Spanish Era", although the date was presumably AD as 1117 Spanish Era was equivalent to 1079 AD. An early 12th century document at Fleury records that "filiam Roberti ducis Bugundionem…Constantiam" married Alfonso VI King of Castile and was mother of a daughter who married "Raymundo comiti". The Chronicon Regum Legionensium names "Queen Constance" as the second of the "five legitimate wives" of King Alfonso. Her second marriage date is estimated based on the likely estimated death date of her first husband in [Nov/early Dec] 1079 and her subscribing a document dated 25 Dec 1079 at Dueñas with her second husband. Queen Constance was instrumental in having the Roman rite replace the Visigothic rite in the churches of Castile. "Adefonsus…Hispaniarum rex…cum coniuge mea Constantia regina" donated property to the monastery of San Salvador de Oña by charter dated 1 May 1092.

The date of her death is fixed by her last known mention in a charter dated 25 Jul 1093 and a donation by King Alfonso to the monastery of Sahagún dated 25 Oct 1093, which does not include Queen Constanza's name in the subscription list. Pérez´s history of Sahagún monastery, published in 1782, states that "Doña Berta…Reyna…está enterrada no lejos de Doña Constanza en la Capilla" of the monastery, but does not quote the inscription which confirms this statement. ¹