The Quest (1982)

The sovereign state of Glendorra has a problem. It seems that through an old agreement with France, unless there's a monarch, the country would revert to France. And the king has no heirs. So, they found four Americans who are descendants of one of the former rulers. So they are sent out on a "Quest" to show if they have the qualities necessary to be a ruler. It won't be easy cause they go forth with no idea what to do, and their information is given to them through poems which they find hard to transcribe.