Evelyn Duke Brandenburger in her 1979 book The Duke's Vol. 1 misinterpreted historical documents and came to the conclusion that Henry Duke's wife was most likely Elizabeth Soane, but that is disproved by a document entitled "Settling The Debate On Who Elizabeth Soane (IV) Married." :
See:
https://freepages.rootsweb.com/~theduffypapers/family/duke/elizabet...