Try English history for
Queen Henrietta Maria, a French princess who married
King Charles I of England but was lucky enough not to get her head chopped off in the Civil War (he did!) - she returned to
France. She was a Catholic, as you would expect French royalty to be, and one of the issues of that war was whether
Charles could be considered a "real" Protestant in view of his marriage - which was an arranged one, of course.
Henrietta Maria was too much of a mouthful for the Royalist armies, who charged into battle yelling "
Queen Mary!" instead.