Actually, ALT-A is totally correct - by very strict standards, D&D is nothing but the original three books that had the "Gygax and Arneson" names on them. The purists can argue that as soon as the next three little books came out, it wasn't D&D any more.
Then, when that horrid AD&D came out, it REALLY wasn't D&D any more.
Which is why I have played D&ME for over 30 years... and that is pronounced "DEE AND ME". Sure, I might use the (insert certain edition here) books, but I've personalized it from the I picked up my DM hat and did a horrid job of turning "The Martian Chronicles" into a setting (as in: Edgar Rice Burroughs' series). It's been all downhill from then.
Crowns? It's been over 30 years since I read the books... throw me a bone here, please!!
As long as it is entertaining for you and the group enjoys your imagination and rules then it doesn't matter if you use the exact rules of D&D, only some of it, or none of it. The main thing is your group enjoys the time spent together. If you can pull that off you should be fine.
It never really mattered to me, I aways tried to enjoy each game with respect.
I would play any thematicly similar fanasty game (Monsters!)