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Why is Sir Dinadan left out of almost all modern versions of the Arthur Story? Only T.H. White gives him as much as a line. I'm simply gobsmacked on this omission. Malory has reasonable coverage, and one version of the Tristan Legend, but nothing modern.
There's The Ballad of Sir Dinadan by Gerald Morris. It's the fifth book in The Squire's Tales series. Also, I am fairly certain Dinadan makes appearances in other books in the series, albeit in a more minor role. Yes, the books are written for younger readers, but I quite enjoy them.