Since the Normand’s are from France, that means the French have ruled England for almost a millennium now.
the Normans were Vikings who invaded France and established a foothold there. The French were unable to evict them. Eventually there was a treaty between the two creating the Dukedom of Normandy.
Throughout the middle ages everybody married everybody, so every royal house is descended from the French, the English, the Spanish, and the many other kingdoms (most no longer existing) throughout Europe.
This treaty, known as the Treaty of Saint-Clair-sur-Epte, allowed the Vikings, led by Rollo, to settle in the area in exchange for their protection against other Viking raids and their conversion to Christianity.