The Norman branch of my family helped to conquer England long ago, after a disagreement over who would be the new king.  There were very few of us of course, and many locals.  Like the original Norsemen in Normandy, we intermarried with the Anglo-Saxons, and from that patronage absorbed the stories of King Arthur and Merlin into our blood.  That they were famous for defending England against invaders was not lost on us.