The King of Dragons. Also on SNES & an arcade cabinet
Dungeons & Dragons: Tower of Doom
Dungeons & Dragons: Shadow over Mystara. Both arcade & an import compilation disc on the Saturn
Dungeon Magic/Light Bringer: This ones from Taito. Arcade & Taito Legends 2(PS2, PC, & X-Box)
Magic Sword: Heroic Fantasy. Arcade & SNES. Not really a beat em up, but very much similar anyway.
None of these are related to Knights of the Rounds, except The King of Dragons pretty much uses the same engine, and the D&D games use a seemingly amped up version of that engine. DM/LB just has that same kind of role-playing brawler thing going on. Could have mentioned Gaiapolis too, but it's top down and has a totally different feel, probably never left arcades.