Thank you for explaining how the Dukes of Norfolk came to be buried there. I think you have to be interested in learning about history when you visit these wonderful castles etc. I have a passion for anything Tudor and Stuart related. Guides provide such a wealth of knowledge that I don't understand how someone can walk in and stay for two seconds.
I'm a descendant too through my mother's side. The only reason I know is because they kept a very well documented line all the way to Mary Maverick(Gye born 1580). The Plantagenet colonist book contains her name as a descendent of the Plantagenets. George W. Bush and Queen Elizabeth 2 both trace their ancestry to Richard Fitzalan.