She founded the abbey of la Trinit at Caen, as confirmed by an undated manuscript which records the death "pridie nonas julias" of "abbatissam Mathildem" in the 54th year in which she held the position and names "Mathildem Anglorum reginam, nostri cnobii fondatricem, Adilidem, Mathildem, Constantiam, filias eius" heading the list of the names of nuns at the abbey.
Her husband appointed Mathilde as his regent in Normandy when he left to invade England, and again after he returned to England after visiting Normandy in 1067: Orderic Vitalis records that, when King William returned to England, , he appointed Mathildi conjugi su filioque suo Rodberto adolescenti to govern Normandy (principatum Neustri), adding that the king took with him Rogerium de Monte-Gomerici whom he had appointed as tutorem Normanni..sua conjuge when he had left for England for the first time.
He succeeded in 1072 as , son of RAOUL [III] le Grand Comte de Valois & his first wife Aelis de Bar-sur-Aube (-[30 Sep/1 Oct] 1080 Rome, bur 1082 Rome St Peter).
The Vita Simonis records a ficitional speech of William I King of England in which he offers his (unnamed) daughter's hand to Simon, specifying that she had previously been betrothed to "regis Hispaniarum Anfursi et Roberti principis Apuli".
There is no basis for assessing her order of birth among the other known daughters of the king. Richardum..Henricum, adding that William succeeded to regno Angli.
An undated manuscript names "Mathildem Anglorum reginam, nostri cnobii fondatricem, Adilidem, Mathildem, Constantiam, filias eius" heading the list of the names of nuns at the abbey Orderic Vitalis names Adelizam et Constantiam, Ceciliam et Adalam as the daughters of Willermus Normanni dux and his wife Mathildem Balduini ducis Flandrensium filiam, neptem..sorore Henrici regis Francorum Orderic Vitalis records that at Fcamp in 1075 King William I entered Ceciliam...filiam suam as a nun at Caen, adding that she later succeeded "Mathilde abbatissa" (who had been abbess for 47 years) and governed as abbess for nearly 14 years until she died III Id Jul 1127Guillaume of Jumiges records that Duke Guillaume and his wife Balduinum Flandri comitem...filiam regali ex genere descendente... Orderic Vitalis names Rotbertum..Ricardum, Willermum et Henricum as the sons of Willermus Normanni dux and his wife Mathildem Balduini ducis Flandrensium filiam, neptem..sorore Henrici regis Francorum His reign was characterised by bitter rivalry with his brother Robert in Normandy, even harsher imposition of Norman rule in England than by his father, and growing resentment of his ways among the nobility.
Orderic Vitalis records that King William I arranged the marriage of "Constantiam filiam suam" and Alanno Ferganno at Caen (presumably indicating the finalisation of the marriage contract) and in a later passage that the couple were married at Bayeux.
What is surprising is that, despite the multiplicity of sources and vast amount of collective study effort, there are still areas where doubt persists.Orderic Vitalis names Adelizam et Constantiam, Ceciliam et Adalam as the daughters of Willermus Normanni dux and his wife Mathildem Balduini ducis Flandrensium filiam, neptem..sorore Henrici regis Francorum.The sources are contradictory regarding the name of the daughter who was betrothed to Harold, as well as the timing of her death.After some delay due to unfavourable weather conditions, the army set sail for England from Saint-Valry-sur-Somme , marched north to Canterbury, then west to Winchester where he captured the royal treasury.
He proceeded to London where he was crowned as WILLIAM I "the Conqueror" King of England at Westminster Abbey, possibly by Ealdred Archbishop of York who may have officiated because of doubts concerning the validity of the appointment of Stigand as Archbishop of Canterbury.Notable among these are:(Chteau de Falaise, Normandy [1027/28]-Rouen, Prior de Saint-Gervais , bur Caen, Abb de Saint-Etienne). Willelmum filium suum was born apud Falesiam Deville suggests that Guillaumes birthdate can be fixed more precisely to [mid-1027], taking into account that his father Robert occupied Falaise immediately after the death of his father Duke Richard II (), not wishing to accept the authority of his older brother Duke Richard III, but that Roberts stay was short as the two brothers were reconciled soon after, it being reasonable to suppose that Roberts relationship with Guillaumes mother occurred soon after his arrival at Falaise It appears that Edward "the Confessor" King of England acknowledged Guillaume as successor to the English throne on several occasions, maybe for the first time during his visit to England in 1051 which is recorded in the Anglo-Saxon Chronicle.