At the Duke's Pleasure (Thorndike Press Large Print Romance)

All the Byrons are just as "mad, bad, and
dangerous to know" as their famous non-relation --
but the time has come for the eldest son to marry.
Edward Byron, Duke of Clybourne, has
everything a man in society needs---except a wife.
Duty requires he wed, so he decides that a long-standing
arranged marriage will do nicely. He knows his bride is
beautiful, biddable, and bright enough to run his household
and nursery. He expects his betrothed, Lady Claire Marsden,
will be thrilled with his decision. Unfortunately, she's not!