According to my research and a book I have in my possession, Derek Wilson wrote "The Uncrowned Kings of England, The Black History of the Dudleys and Tudor Throne" pg. 4, "Their family name was Sutton but from the mid-fifteenth century they began to call themselves the Lords of Dudley, Worcestershire after the manor which formed the basis of their power and wealth. Dudley Castle in Worcestershire, the impressive remains of which can still be seen, was begun soon after the conquest, and testifies that these landowners had been men of substance for centuries. The man who may be regarded as the founder of the Dudley greatness was Edmund's grandfather, John, sixth Baron Dudley."