YA. Duke and duchess go to an American university pretending not to be royal. Believe they used Duke as their last name. Read 2-5 years ago.

[Kathleen]

I know it was some type of royalty that went to an American university acting like a normal pair of students. I believe they were married or engaged. I swear one of the titles was “the duke’s go to Princeton” but am having no luck finding this.

I remember there being a line that where the narrator makes a comment about being cheeky and using Duke as their last name.