It's hard to credit some of the stuff I'm seeing from fellow reviewers on this page. Maybe they don't believe Mr. Alexander when he says The Foundling and Other Tales is perfectly capable of standing on its own, but a single reading of this wee book should clue everyone in as to exactly what it is they are holding. Namely: This is a book of fables, or would-be legends; it isn't meant to answer burning questions about the population of a long-running series (although apparently it does in part fulfil this function, too), and it isn't meant to provide deep characterisation of any kind, really. Realism is not part of the agenda; people in the book act in ways that fulfil the moral imperative of the tales, and nothing more.
It's quite good at this, too. This won't rock the world of anyone, I suspect, least of all those over a certain basically arbitrary age, but it's fun; i'd read these cute little stories aloud to my children, if I had any. I think the tales, which are loosely based, says the very humble-seeming Alexander in his foreword, on Welsh legends, work best when he is putting flowery words in the mouths of his archetypical characters: bards, enchanters, farmers and fairies, all of whom speak in the grandiose and florid language of ancient embellished oral traditions. The story about the three enchanters vying for the hand of a princess was probably my favourite. It reminded me a little of Jack Vance, even, what with the mages putting on a contest of conjurings to impress the lady. The story about the bard-king who acquired a beautiful harp which always played the most alluring of melodies, but whose strings broke whenever the flamboyant man told an exaggerated truth or outright lie, got a chuckle out of me. The morals in these tales are very simple and obvious, but I suppose that's really how it should be, and there's a little intrigue in seeing what Alexander does to get us there.
I read a few of the Prydain books when I was in elementary school. I am pretty sure I never read the whole series; in fact I probably only read three of the five books, and the only one I remember at all is The Black Cauldron. I didn't recall a single character's name or situation from the books, and so I came at this without any expectations of gaps being filled in an extatn series. Ultimately, I believe that were the name of Prydain not slapped onto this book, its purpose would have been just as well served, or maybe even better served, since one would only expect a series of fabulistic tales set in a nebulous world of enchantment and fey folk, which is precisely what this book is. However, not only is it a coup for the publisher to tie this in with Alexander's series of novels, but I see what he's trying to do here is bring us a little closer to the Welsh tales from which he drew his original inspiration, by distilling his storytelling right to the source, as it were. A few characters from the novels do get name-dropped, but as I said, they meant nothing to me.