DOES THE KING'S HORSE RING A BELL WITH ANYONE...?

One day back in the late '60s, my father brought home a book for me which contained various children's stories.  The book wasn't new, so he'd most likely bought it in a jumble sale or 'The Barras'.  Amongst the tales within its pages were The Three Billy Goats Gruff, The Little Red Hen, one about two kids looking after a hedgehog, and The King's Horse.  (Or it may've been The King's Bell.)  There were others of course, but those are the ones I remember.

My favourite story was The King's Horse (or Bell), which was about a King who installed a bell in the town square, for any of his subjects to ring in order to obtain justice in matters where they had been wronged.  The way I remember it, the King had a horse who, when it was no longer of use to him, was turned out into the street to fend for itself.  One cold winter's night, the bell is heard ringing in the square, and when the King turns up to see who needs his help, is ashamed to see that he himself is the guilty party, is overcome with remorse, and the horse returns to its comfy stable to live happily ever after.

The tale is based on Henry Wadsworth Longfellow's poem The Bell Of Atri, which has been rewritten as a prose story more than once, I believe.  However, in the original version, the horse doesn't belong to the King, but a knight (or soldier), so I'm left to wonder if I might be mis-remembering the details, or a little artistic license had been taken with events in order to provide an ironic ending to the tale.  (Y'know, King who wants justice for others is himself guilty of inflicting an injustice on another - in this case his horse.)

So Criv-ites, the call goes out.  Have any of you ever read the version I remember, or owned the book of which I speak?  If any of you actually have the book, I'd be prepared to purchase it for a more than reasonable price.  You know where the comments section is.