After his victory at the Battle of Hastings, William marched on London and received the city’s submission. On Christmas Day, 1066, he was crowned the first Norman king of England, in Westminster Abbey, and the Anglo-Saxon phase of English history came to an end. French became the language of the king’s court and gradually blended with the Anglo-Saxon tongue to give birth to modern English. William I proved an effective king of England, and the “Domesday Book,” a great census of the lands and people of England, was among his notable achievements. Upon the death of William I in 1087, his son, William Rufus, became William II, the second Norman king of England.