This also brings up the Kuttner point. But, unlike Kuttner, it's probably fair to say de Camp really was primarily a fantasy author, though he is one of the few authors to have the double barrels of SFWA Grand Master and WFA Life Achievement. (I think the others are Ray Bradbury, Harlan Ellison, Philip Jose Farmer, Ursula K. Le Guin, Fritz Leiber, Michael Moorcock, Andre Norton, Jack Vance, and Jack Williamson.)
He's also known for the time travel/alternate history novel Lest Darkness Fall, the stories and novels that range from science fiction to science fantasy (possibly all the way to sword and sorcery - dunno, haven't read enough) and make up the "Viagens Interplanetarias" series, including Rogue Queen and the "Z" books, and many excellent stories such as "A Gun for Dinosaur".
But anyway - I guess (assuming people read the whole thread) it's clear that the topic's changed to "author's whose sword and sorcery is (may be) forgotten", so I guess this is now off-topic.
As far as the topic, I've actually read The Tritonian Ring but, perhaps unsurprisingly, didn't much care for it - IIRC, it was fine, but just not my thing or so great that I had to love it regardless.