In lieu of a proper post, here’s the openings and endings to Toei’s 1979 and 1980 King Arthur based shows. The first one is sorta faithful to the myth. The second one is apparently set in the future!
I’d heard of neither until was reading up on the Animage Grand Prix awards and seeing Akira Kamiya had gotten the Seiyu award in 1980 and the wiki page noted the first show as the notable character he got the award for.
Proper posts will low on the ground at the moment as I’ve injured the tendons in my foot. No I don’t type with my feet, but I have to have it elevated and working at the PC like that is an inconvenience.