Around 1000 AD, the French King left some Vikings to live in France in exchangecof protection against other Vikings and they converted to Catholicism too.
After years, they said that they were very tired of living in Normandy and in 1066 AD, decided England and conquer it from Anglo-Saxons. The people called William the Bastard; when his father died, inherited his title of Duke of Normandy. When the king of England died, he wanted to dominate the country. In the battle of Hasting, the Anglo-Saxon king died becausehe has an arrow stuck in an eye, and William started to dominate England in Westminster Abbey and he built te Tower of London for his family and himself.
But William and his spoke French and the other people spoke English. For a long time two languages were spoken.