That is a good question, which has occurred to me before in passing, though I've never given it much thought. I would assume he became interested in it at some point during his classical British education? Correct me if I'm wrong, but mythology used to be a big part of school curriculum, if not directly than through other classical works. Why C.S. Lewis would get so attached, I don't know. Personally I went through a phase of fascination with Greek mythology particularly, and would literally spend an hour reading the synopses of the stories in my family dictionary.

If you can get a copy of Surprised by Joy, it tells a bit about how he was reading the older sort of mythical/heroic story as a boy, and how it really moved him.

yes, Lewis goes quite a bit beyond the 'mere', concise, elementary or
'four-squared' Christianity, as we sum up all his work.

although he was trying to be concise when speaking to audiences
outside of academy, so he said. Probably with some success,
he was aware of the Problem of simplicity.
(It's a lot of work ..)

but then, he was insistent in the belief that mythology supposedly
has a potential to lead, at least some persons, towards Christian faith.

A sentiment open to doubt?
Anyway it's a sentiment - as mythology does not prove things,
it's rather suggestive and arguably dense in archetypal matter,
this depending on your definitions.
'archetypal matter', if we know what that is, is supposed to be
psychologically potent, that is: it may hit hard.

That is why I am rather open to doubt about baptizing pre-Christian
traditions and myths, generally.
Some academics of well-read brilliant minds may be capable of
sorting out these matters. We hardly know precisely, how do we
measure a professor's mind?

Lewis may have been too confident on behalf of his audiences' minds
after 'all' ?

btw, 'Surprised by Joy' details these matters a bit, like Coracle hints us.

If you can get a copy of Surprised by Joy, it tells a bit about how he was reading the older sort of mythical/heroic story as a boy, and how it really moved him.

I can see how that could be a motivating factor. I wanted to put a faun in a skit for a class and without the CoN I won't have been so attached to fauns. The other group members must have thought I was nuts and we ended up with a centaur instead.

The following quote from the Weight of Glory but help to explain it some.

In one way, of course, God has given us the Morning Star already: you can go and enjoy the gift on many fine mornings if you get up early enough. What more, you may ask, do we want? Ah, but we want so much more—something the books on aesthetics take little notice of. But the poets and the mythologies know all about it. We do not want merely to see beauty, though, God knows, even that is bounty enough. We want something else which can hardly be put into words—to be united with the beauty we see, to pass into it, to receive it into ourselves, to bathe in it, to become part of it. That is why we have peopled air and earth and water with gods and goddesses and nymphs and elves—that, though we cannot, yet these projections can enjoy in themselves that beauty, grace, and power of which Nature is the image.

It makes sense. For some reason people are attracted to nymphs and elves. Lewis clearly knows that these "people" are not real but are created by humans. Lewis probably didn't see it as going against Christianity. Many of the mythical creatures serve Aslan so in Narnia they are not "pagan."

I have to say, Twigs, that quote from The Weight of Glory is so perfectly worded. As an author, it made something in my heart go "that's exactly it!" I must admit I have never read that book before (I actually had to google it to confirm that the author was, indeed, Lewis, ), but it sounds very interesting. Does Lewis write extensively on the topic in there?

Many of the mythical creatures serve Aslan so in Narnia they are not "pagan."

I think you bring up another interesting point here, taking your idea and stretching it beyond Narnia. To apply the same idea in our world, where, while some cultures did tie mythical beings to pagan religions, they were not necessarily creations from paganism, but rather ones that were later incorporated. Take the minotaur for example. Most people credit his being to Greek influences, when in reality the half-bull half-man creature has appeared many times in history and around the world. The Assyrians and, earlier, Babylonians also had minotaurs in their art and lore--we just happen to have picked up the Greek name.

Narnia itself shows the value in putting Christian themes and messages in a less obvious way. He was a firm believer in expressing truths through other means, such as fantasy and fiction. It is also notable that many mythologies have similar plots or characters, and Lewis believed that they were all based on Christian truths. Therefore, he had no problem in using mythology as a means to convey Christianity.

Did Lewis ever write an essay on mythology? I feel as if I've heard of one before, but I can't seem to find anything when I look for it now.

Try "Myth Become Fact." It's an article that discusses how ancient myths seem to reflect the story of Christ's coming; that is, mythology is full of stories of gods who come to die and sacrifice for the people. (Lewis was unnerved as a young atheist at hearing a hardened skeptic admit that the "dying god" theme in mythology made it possible to believe that a god (or God) would come to do such a thing.)

Keep in mind, Myth Became Fact is a book by Brian Godawa, although it looks quite fascinating

I believe Lewis actually wrote a book about George McDonald, so I would assume he at least touches on mythology there. Perhaps, Valiant_Nymph you might look at Sometimes Fairy Stories May Say Best What's To Be Said, that Lewis wrote? More on fairytales than mythology as a whole, but it's the closest I'm finding after thumbing through several collections of his essays.

This was recently on British radio:
https://www.bbc.co.uk/programmes/m000ckvz

"Although it was written nearly seventy years ago, ‘The Lion, the Witch and the Wardrobe’ still appears in the top ten favourite children’s books and has sold over 100 million copies in 47 different languages. It's set in the magical Land of Narnia where the White Witch has cast a spell to make sure that it is always winter and Christmas never comes. This changes when four siblings – Lucy, Peter, Susan and Edmund – stumble into Narnia through the back of a wardrobe and defeat the evil that has engulfed Narnia with the help of the mighty lion Aslan. For some readers, ‘The Lion, the Witch and the Wardrobe’ is an allegory of the story of Jesus. Many others view it simply as a good yarn. To discuss the religious message behind the book – and whether or not it really matters – Ernie is joined by three authors: Lucy Mangan, Frank Cottrell-Boyce and Francis Spufford. Extracts are read by Julie Hesmondhalgh."

Spufford is the guy who wrote and self-published some fan fiction. Cheeky devil, getting onto this discussion of Lewis!

If he believed that mythology contains some truth it would appeal to Lewis.  He also liked magic, which appeals to the imagination as much as mythology does.  So why not use the mythology as something to communicate the truth and provide some magical entertainment at the same time? That’s what makes the Narnia books so interesting.

Posted by: @narnian78

If he believed that mythology contains some truth it would appeal to Lewis.  He also liked magic, which appeals to the imagination as much as mythology does.  So why not use the mythology as something to communicate the truth and provide some magical entertainment at the same time? That’s what makes the Narnia books so interesting.

That's how I have always seen it especially after reading Till We Have Faces (One of my favorite books of all time).   I felt that he had a respect for other traditions and saw things in them that were comparable to his own beliefs.  

I think Lewis as an academic and literature professor saw plenty of cultural value in mythology. And I believe his Christianity did not compel him to be some sort of puritanical zealot who would wish to purge every shred of pre-Christian culture from his influences.

On a side note, I thought it was really cool how he used Greek mythology in one of his posthumously published manuscripts (one of the "other stories" in The Dark Tower and Other Stories), where an astronaut is sent to the moon to investigate the disappearance of previous expeditions. Some dialogue touching on the fact that the once-mythical city of Troy turned out to be real, foreshadows the ending. The astronaut finds the previous astronauts had all been turned to stone, and then he meets Medusa and presumably suffers the same fate. It's been a few years since I read that story but it really stuck with me.