“Good King Wenceslas” (YouTube) is a song I learned in elementary school. The narrative is actually pretty weird. A king’s magical powers are downplayed in favor of extolling charity and sharing.
What sells it for me is the extra verse, which I saw years later in an episode of Phineas&Ferb (Wiki). Buford Von Stomm, in order to establish that he knows the whole story, gives us this:
The words were by an English guy.
The music, Scandinavian.
Wenceslas was five-foot-six.
He kept his face unshaven.
Though just a duke throughout his life,
He always ruled so justly
His kingly title was conferred
Upon him posthumously.