“William the Conqueror was born in Normandy, France (1027), and of Viking lineage. He was Duke of Normandy in 1035, and King of England by 1066.”
Thomas Paine referred to him as “the son of a prostitute, and the plunderer of the English nation”.
William the Conqueror was also known as "William the Bastard."
Oh, and many English Kings where known to "plunder."
Point remains, William I was a "foreigner" who took the English crown.