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.Orderic Vitalis identifies Agatha as the daughter who was betrothed to Harold (see above): he records that Agatha regis filia, who had previously been betrothed to Heraldo, was betrothed to Amfurcio regi Galleci but died before the journey and was buried in ecclesia sanct Mari..urbe Bajocensi, son of FERNANDO I King of Castile & his wife Infanta doa Sancha de Lon (Compostela -Toledo , bur Sahagn, Len, San Mancio chapel in the royal monastery of Santos Facundo y Primitivo).
Duke Guillaume branded Harold a perjurer and appealed to Pope Alexander II for support.After receiving a papal banner in response to his request, William gathered a sizable army during summer 1066 in preparation for invasion.The necrology of Chartres cathedral records the death "VII Id Dec" of "Adeliza filia regis Anglorum", stating that her father made a donation for her soul.She is not named as a daughter of King William by either William of Malmesbury or Orderic Vitalis.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.
The latter had received his pallium in 1058 from Pope Benedict X, later regarded as anti-Pope, an appointment which had not been regularised by Pope Alexander II.
Orderic Vitalis records that King William was crowned again at Winchester by cardinales Roman ecclesi...
The supposed betrothal to Robert of Apulia (which would have to refer to Robert "Guiscard" Duke of Apulia) is unrecorded in the numerous other sources dealing with his life and is probably pure fantasy.
This does not instil confidence with respect to the historical accuracy of the whole passage, but if it is correct the daughter in question would presumably have been Agatha who was probably the daughter of King William betrothed to "Amfursio regi Gallici" (see above).
The genealogy of the kings of England after the Norman Conquest of 1066 is so well known that it needs little introduction.