Continued... In the eleventh century, Edward the Confessor, the last of the Anglo-Saxon kings of England was best known for the building of Westminster Abbey and for his saintliness. Many healings were attributed to this pious and gentle king. From then on it became traditional for English kings and queens to be crowned in Westminster Abbey, with the Archbishop of Canterbury performing the service.

From Wikipedia: William the Conqueror was a special case as he was seen as an invader of England in the 11th century.He wanted his reign to be legitimized. After receiving continental reinforcements, William crossed the Thames at Wallingford, and there he forced the surrender of Archbishop Stigand (one of his rival Edgar's main supporters). William reached Berkhamsted where Ætheling relinquished the English crown personally and the Saxon noblemen of England surrendered. Although William was then acclaimed as the King of England, he requested being crowned at London. As William I, he was formally crowned on Christmas day 1066, in Westminster Abbey, by Archbishop Aldred.[ who had surrendered beforehand] This was what is now known as the Norman Conquest. Unable to enter London, William traveled to Wallingford, was welcomed in by Wigod who supported his cause. This is where the first submissions took place, including that of the Archbishop of Canterbury.The remaining Anglo-Saxon noblemen surrendered to William at Berkhamsted, Hertfordshire and he was acclaimed King of England there. William was then crowned on December 25, 1066, in Westminster Abbey